Primary
Core
Secondary
Hip flexors
Equipment
Bodyweight
Difficulty
Beginner
Type
Pull
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The example below shows one possible placement. Your purchased plan is built from your assessment, and Ely checks every exercise before approving it.
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This page is not medical advice or a rehabilitation protocol. Ely's personal review applies to purchased workout plans and does not replace an in-person assessment by a licensed healthcare professional.
Sit-ups are the classic full-range spinal flexion exercise that involve coming all the way up from lying to sitting. Unlike crunches which use a short range, sit-ups work through full hip flexion. This involves more hip flexor recruitment alongside ab work.
When to use it
Use for full range ab training.
Who it's for
All fitness levels looking to build strength and muscle definition.
Lie with knees bent and feet flat or anchored. Cross arms over your chest or place hands behind your head without pulling on your neck. Sit all the way up until your torso is vertical, then lower with control. Anchoring feet allows more hip flexor assistance.
Also targets: hip flexors
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Lie on your back with knees bent.
Feet can be anchored or free.
Cross arms over chest or behind head.
Sit all the way up toward your knees.
Lower back down with control.
Full range of motion.
Different from crunches - full range.
Control the movement.
Don't pull on your neck.
Anchoring feet uses more hip flexors.
Use sit-ups when you want full range ab training with hip flexor involvement. They work well for general fitness and conditioning. For pure ab isolation, crunches are preferable. For progressive overload, weighted or decline sit-ups add challenge.
Pulling on neck for optimal results.
Craning your neck during the Sit-Up changes your upper-body position and can make the rep less stable. Keep your head aligned with your torso and use a consistent gaze.
Using momentum instead of controlled muscle contraction.
Bouncing or using momentum during the Sit-Up makes the movement harder to control and can shift work away from your Rectus abdominis. Use a load you can move smoothly through the intended range.
Not controlling descent.
On an upper-body pulling movement like the Sit-Up, this mistake can shift work away from your Rectus abdominis. Keep your torso stable and guide the load through the intended pulling path.
All fitness levels looking to build strength and muscle definition.
These ranges illustrate ways to organize training. They are not an individual prescription. Adjust them for the exercise, your experience, and the rest of your program.
Heavier loads can be useful for developing maximum strength. The range shown is an example, and the load must match your current technique and capacity.
Muscle growth can occur across different loads and repetition ranges. This example is not a uniquely effective zone; your overall program and effort also matter.
This is an example of a longer set. A repetition target alone does not establish joint safety or whether the exercise is appropriate for you.
Example: 3 sets of 15-20 reps. Rest 45s.
Background for resistance exercises: the 2026 ACSM position stand covers healthy adults, and a load-comparison review found similar muscle growth across loads in studies using sets taken to muscular failure. These findings do not validate every exercise-specific range shown here or require training to failure.
This is one example of how Sit-Up could sit inside a complete workout. Your plan may use different movements after Ely checks your assessment.
Sample workout
MySetPlan guides you set by set, times your rest, records your work, and tells you what to do next from the plan Ely approved.
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Frequently Asked Questions About the Sit-Up
The Sit-Up primarily targets the Rectus abdominis, making it an effective exercise for core development. Secondary muscles worked during the Sit-Up include Hip flexors, providing additional training stimulus. Stabilizer muscles engaged include Lower back.
Our library labels Sit-Up as beginner. That category is not an individual assessment. Review the setup, movement instructions, and safety notes, and seek qualified guidance if you are unsure how to perform it.
The programming section shows examples for Sit-Up. The appropriate amount depends on your current ability, the exercise, and your other training. The listed ranges are not an individual prescription or a guarantee of a particular outcome.
The main equipment listed for Sit-Up is no equipment. Check the instructions for any additional support, anchor, bench, rack, or clear space needed. The equipment label alone does not confirm that your home setup is suitable.
Good alternatives to the Sit-Up include: Crunch, V-Up. These exercises target similar muscle groups as the Sit-Up and can be used as substitutes based on your equipment availability, gym setup, or training preferences.