Sit-ups are one of the most common exercises to train the abdominals, but some people find it difficult to do them without lifting their feet. This is considered improper form and should be corrected so you can ensure youโre targeting your abs effectively.
So how do you do a sit-up without lifting your feet? To do a sit-up without lifting your feet, youโll need to work on building overall strength in the abdominals. You can also do butterfly sit-ups instead, bring your feet further away from your butt, focus on curling your torso up one vertebrae at a time, and do your sit-ups at a slower pace.
While you may see people putting their feet under something or having a friend hold their feet when doing sit-ups, I donโt recommend this. It changes your technique so you have to rely more on your hip flexors to sit up, and it places a lot of strain on your lower back.
In this article, Iโll discuss:
- What a sit-up is
- Reasons why you canโt do a sit-up without lifting your feet
- If itโs bad for your feet to come up when doing sit-ups
- Tips for doing sit-ups without lifting your feet
- Whether or not you should anchor your feet when doing sit-ups
Table of Contents
What Is a Sit-Up?
A sit-up is an abdominal (or ab/abs) exercise. Itโs done by lying on your back with your knees bent and feet flat on the floor and lifting your upper body while keeping your buttocks in contact with the floor. You can place your arms across your chest or put your fingertips behind your head.
Sit-ups are done to strengthen the abdominals. They are often performed during circuit training or high-intensity interval training (HIIT) workouts. Theyโre also frequently included in physical fitness tests to examine an individualโs strength and endurance levels.
In addition to sit-ups, cable crunches are a highly effective ab strengthening exercise. But if you donโt have access to a cable machine or are looking for more variety, try one of these cable crunch alternatives.
Reasons Why You Canโt Do A Sit-Up Without Lifting Your Feet
Five reasons you canโt donโt a sit up without lifting your feet are:
- Your abdominal muscles are weak
- Your body weight and/or proportions arenโt suitable for sit-ups
- Youโre not using proper form
- Youโre doing sit-ups too fast
- You only ever do sit-ups with your feet anchored
1. Your Abdominal Muscles Are Weak
One of the main reasons why you canโt do a sit-up without lifting your feet is that you have weak abdominals.
Your abdominals are the muscles at the front of your midsection. They are responsible for holding you up straight and protecting the organs. They also play an important role in functions such as bending forward at the waist and, well, sitting up.
If your abs arenโt strong enough to support you, youโll have difficulty keeping your feet on the floor as you perform a sitting-up motion. Theyโll come up a few inches to compensate for the lack of core strength.
If you canโt do a sit-up at all, you may also have weak hip flexors. Check out I Canโt Do a Sit-Up: 7 Reasons Why & How To Quickly Fix for ways you can improve this.
2. Your Body Weight and/or Proportions Arenโt Suitable for Sit-Ups
Even though a sit-up may seem like a basic exercise, itโs harder for certain individuals to do it based on their body weight and limb proportions – similar to how some individuals may have difficulty squatting because they have long legs, for example.
You may not be able to do sit-ups without lifting your feet if you carry a lot of extra weight in your midsection but have smaller legs. This is because your body weight isnโt distributed evenly and your body canโt stay balanced as youโre doing sit-ups.
Women with larger busts may also struggle with a similar issue. Being more top-heavy means thereโs more weight in the upper body that you have to pull up. If your core isnโt strong enough to pull up that extra weight without assistance, your feet can come off the floor.
3. Youโre Not Using Proper Form
Even though sit-ups are a relatively basic exercise, itโs easy to perform them incorrectly. Common technique errors include pulling on your neck if you keep your hands behind your head, keeping your feet too close to your glutes, and arching your back too much.
Sit-ups are just like any other exercise – a breakdown in form will usually result in your body doing something to overcompensate. With sit-ups, that could be your feet coming off the floor.
4. Youโre Doing Sit-Ups Too Fast
Speeding through your sit-ups can prevent you from concentrating as much as you should on using proper form with each rep. You focus more on completing reps as quickly as possible and using momentum to sit up faster than properly engaging your abdominals.
Itโs easy to let technique issues such as your feet lifting off the floor slide when youโre focusing more on quantity than quality.
5. You Only Ever Do Sit-Ups With Your Feet Anchored
If you try to do sit-ups without anchoring your feet (i.e. putting them underneath a piece of furniture or having someone hold them down) but canโt, then get frustrated and revert back to doing sit-ups with your feet weighed down, youโll be doing yourself a disservice.
Doing sit-ups with your feet anchored turns them into more of a hip flexor exercise, and youโll never get any of the core-strengthening benefits if you only ever do them this way.
If youโre also not doing any other core work to strengthen your abs, you wonโt be able to make them strong enough that you can do sit-ups without lifting your feet.
Related Article: 10 Best Side Crunch Alternatives (With Pictures)
Is It Bad to Lift Your Feet When Doing a Sit-Up?
It is bad to lift your feet when doing sit-ups. Even if they only come up a couple of inches, it throws off your balance, which means you wonโt be able to complete the rep efficiently because youโre not letting your abs do most of the work.
It also forces you to use momentum by โrockingโ your body as your feet touch and come off the floor with each rep. Youโll essentially just be leveraging your legs to help you sit up and go back down to the floor, which means your abdominals wonโt be doing their job.
Furthermore, using too much momentum can result you in โthumpingโ your back on the floor every time you return to the starting position. This will become uncomfortable after just a short time and can cause soreness in your back.
5 Tips for Doing a Sit-Up Without Lifting Your Feet
Five tips for doing sit-ups without lifting your feet are:
- Bring your feet further out
- Do butterfly sit-ups
- Slow down your sit-up pace
- Think about curling your spine up
- Strengthen your abs with other exercises
1. Bring Your Feet Further Out
One of the easiest ways to do a sit-up without lifting your feet is to move them out further so theyโre not so close to your buttocks. Depending on how long your legs are and how strong your abs currently are, you may need to place your feet about 16 inches or more away from your glutes.
This helps distribute your weight on the floor more evenly and keep your entire body more balanced, making it easier for you to keep your feet down when doing sit-ups.
2. Do Butterfly Sit-Ups
A butterfly sit-up is when you let the soles of your feet touch each other and your knees flare out to the sides. Instead of crossing your arms across your chest or keeping your hands behind your head, youโll typically touch your fingertips above your head while your back is on the ground and touch your feet when youโre in the sitting position.
By doing sit-ups in this position, you have less of a tendency to lift your feet because it opens your hips more and puts them in a more comfortable position.
As well, your thighs wonโt stop you from sitting up all the way so you can move through a larger range of motion, which keeps the tension on your abs for longer. It also takes your hip flexors out of the equation so you can target the abs more effectively.
3. Slow Down Your Sit-Up Pace
Whether youโre doing sit-ups or any other movement, itโs easy to let form slip when trying to move fast. Doing your sit-ups at a slower pace will allow you to concentrate on your form and focus on keeping your feet on the floor.
There are times when you may want to do your sit-ups as quickly as possible – for example, if youโre doing them in a CrossFit workout or trying to get as many reps as possible for a fitness test.
But if youโre doing them at the end of a workout to work on your abdominal strength, youโll benefit from slowing them down. Not only will this help you keep your feet on the floor, but it will also ensure youโre targeting your ab muscles effectively rather than working the hip flexors or straining your lower back.
You donโt necessarily have to count to a specific number with each rep you do. Just make sure youโre moving at a pace that lets you complete each rep with good form so you can feel your abdominals working and not have to raise your feet.
4. Think About Curling Your Spine Up
One cue that can help you keep your feet on the floor during sit-ups is to think about curling your spine up one vertebrae at a time rather than keeping your back completely flat. This will ensure youโre not relying too much on your hip flexors to get your torso all the way up, especially if youโre used to doing sit-ups with your feet anchored.
This cue can also help you slow down your sit-ups so you can concentrate more on your form as I described above.
5. Strengthen Your Abs With Other Exercises
Doing more sit-ups can help you perfect your form so you learn how to do them without lifting your feet. But theyโre not the only core-strengthening exercise you can do, and you may benefit from also doing other ab exercises if your core is particularly weak.
Other excellent ab exercises you can include in your routine are:
- Planks
- Ab roll-outs
- Pallof presses
- Hanging knee raises
- Deadbugs
- Birddogs
- Cable crunches
As your core gets stronger, youโll likely find that your ability to do sit-ups without lifting your feet improves.
Wondering if you could just do squats or deadlifts to strengthen your abs? Check out the following articles:
- Do Deadlifts Work The Abs? (Yes, But Not How You Think)
- Do Squats Work The Core? Research From 5 Studies
Should You Anchor Your Feet When Doing Sit-Ups?
It is not recommended to anchor your feet when doing sit-ups. While this makes the exercise easier, it also reduces its effectiveness.
Putting your feet under something or having someone hold them down when doing sit-ups encourages you to use more of your hip flexors than your abdominals. Youโll also likely feel your quads engage more as your legs push against the weight holding your feet down, and your abs will no longer be doing much of the work.
Anchoring your feet when doing sit-ups also increases the likelihood of arching your back, which pulls on the muscles in your spine. This can cause lower back discomfort or lead to muscle strains.
However, there are some instances where you may want to anchor your feet to do sit-ups.
For example, when you do sit-ups in a physical fitness test, youโll most likely have someone hold your feet. If youโre preparing for a test, practicing with someone holding your feet or anchoring your feet under something else will enable you to replicate the conditions youโll be tested under.
Related Article: Are Planks Better on Elbows or Hands? (Pros & Cons)
Frequently Asked Questions
Why Canโt I Keep My Feet Down When Doing Sit-Ups?
Reasons why you canโt keep your feet down when doing sit-ups are that your abs are too weak, youโre using improper technique (i.e. keeping your feet too close to your butt), youโre doing them too fast, or your body weight or limb proportions make it more difficult for you to do so.
Should You Put Your Feet Under Something When Doing Sit-Ups?
You shouldnโt put your feet under something when doing sit-ups because it forces you to use more of your hip flexors and less of your ab muscles. It can also lead to strains in the lower back muscles. However, if youโre doing sit-ups for a fitness test, anchoring your feet can help you do more reps within a set time.
Final Thoughts
Not being able to do sit-ups without lifting the feet is a common issue, but itโs one that should be fixed. Doing sit-ups this way can cause you to use momentum to get your torso off the ground, which takes the emphasis off the abdominals and makes the movement ineffective.
Strengthening your abs, adjusting your technique, slowing down your tempo, and focusing on lifting one vertebrae at a time from the floor can all help you keep your feet on the floor when doing sit-ups. You can also try butterfly sit-ups to put your hips in a more comfortable position and help your body stay more balanced.
However, unless youโre preparing for a physical fitness test, I donโt recommend anchoring your feet. This puts more emphasis on your hip flexors and takes the focus off your ab muscles.
About The Author
Amanda is a writer and editor in the fitness and nutrition industries. Growing up in a family that loved sports, she learned the importance of staying active from a young age. She started CrossFit in 2015, which led to her interest in powerlifting and weightlifting. She's passionate about helping women overcome their fear of lifting weights and teaching them how to fuel their bodies properly. When she's not training in her garage gym or working, you can find her drinking coffee, walking her dog, or indulging in one too many pieces of chocolate.