How to do a Decline Sit Up
Reviewed by JP Michelsen, CPT, B.A. Kinesiology
About Decline Sit Up
Decline Bench
Target muscles worked
Instructions for Proper Form
Decline Sit Up is a variation on the more common Sit Up. By laying back on a decline bench, you can keep more tension on your abdominals at the top of the movement. This is a great exercise for adding a bit more of a challenge to your Sit Ups.
- Adjust the decline bench to the desired angle and secure your legs to the bench. Position both your hands behind your head.
- Engage your core to raise your torso off the bench while keeping your back straight. Exhale on the way up.
- Pause at the top of the movement before you lose tension in your core.
- Slowly descend back to the starting position while maintaining tension in your core.
- Maintain good posture by keeping your shoulders back, chest up and core engaged throughout this exercise.
- You should feel this exercise in your abdominals.
Common Form Mistakes
Resting Between Reps
Keep your core engaged for the duration of the exercise, even between reps. This exercise is designed to add instability that your core needs to compensate for. Keeping your core engaged throughout the exercise will improve the effectiveness of the exercise.
Sets & Reps Calculator
Average Decline Sit Up standards by male, female, gender, weight, age and height
Use this calculator to see Fitbod's possible first recommendations for you. This would be your starting line, based on more than 4.5 billion logged sets from 1.1 million users.
- beginner3sets9reps1 Set Max10reps
- intermediate4sets9reps11reps
- advanced4sets10reps12reps
Enter your stats to calculate your Sets & Reps
Alternative Exercises to Decline Sit Up
1. Ab Crunch Machine
96.1 mSCORESWAPPED 1,399 TIMESAb Crunch Machine is a variation of Crunches performed with a machine. Unlike standard Crunches, the use of a machine gives you more control over your resistance. In addition, the machine will restrict your range of motion allowing you to focus more on exertion than stabilizing the movement.
- Intermediate
- Abs
- Ab Crunch Machine
2. Crunches
94 mSCORESWAPPED 1,096 TIMESCrunches are one of the most common exercises out there. It’s an easy to perform, bodyweight exercise that targets your abdominals. Crunches are very similar to Sit Ups, however, instead of raising your upper body all the way into a near sitting position, you only raise your shoulder blades off the ground. This is a great exercise for beginners looking to build core strength.
- Beginner
- Abs
3. Sit Up
93.8 mSCORESWAPPED 982 TIMESSit Up is one of the most common exercises out there. It’s a bodyweight exercise that targets your core. Sit Ups are very similar to Crunches, however, rather than raising just your shoulder blades off the ground, you raise your entire upper body. This gives you a bit more range of motion than Crunches, however you’ll start to lose some tension in your core at the top of the movement.
- Beginner
- Abs
4. Leg Raise
96.5 mSCORESWAPPED 741 TIMESLeg Raise is a simple bodyweight core exercise that involves laying on the ground and suspending your legs in the air. While your core does play a significant role in raising your legs, the real benefit comes from controlling their descent back to the floor.
- Beginner
- Abs
5. Plank
92.8 mSCORESWAPPED 727 TIMESPlanks are one of the most common core exercises out there. This is a bodyweight exercise that is performed for time rather than reps. Planks don’t require any movement, instead they force you to place yourself in a position that requires you to engage your core, and maintain that muscle activation for the duration of the exercise. This is a great way to help build strength and stability in a way that will translate to a variety of other exercises, and your daily life.
- Beginner
- Abs
6. Vertical Knee Raise
92 mSCORESWAPPED 630 TIMESVertical Knee Raise is a bodyweight core exercise that involves suspending yourself, and then engaging your core to raise your knees towards your chest. By keeping your torso upright, and raising your knees, this exercise is a bit better for building functional, real world strength.
- Beginner
- Abs
- Vertical Bench (Vertical Knee Raise)
7. Vertical Leg Raise
82.2 mSCORESWAPPED 594 TIMESVertical Leg Raise is a more challenging variation of Vertical Knee Raise. By keeping your legs straight as you raise them up and away from you, you add significantly more resistance to this exercise. Keeping your legs extended also forces you to engage your quadriceps. This is a great variation for anyone looking to make their Vertical Knee Raises more challenging.
- Intermediate
- Abs
- Vertical Bench (Vertical Knee Raise)
8. Russian Twist
96.2 mSCORESWAPPED 592 TIMESRussian Twist is one of the more common core exercises. This exercise targets multiple muscles in your core, but the reason for including this exercise is usually to target your obliques. By raising your feet off the ground, engaging your core, and twisting to each side, you can better target this specific muscle in your core.
- Beginner
- Abs
9. Bicycle Crunch
91.8 mSCORESWAPPED 592 TIMESBicycle Crunch is a more difficult version of a standard crunch. Instead of raising your torso off the ground for each rep, you keep your torso off the ground, and your core engaged. By cycling your legs, you add more instability to the movement, which leads to better core activation.
- Beginner
- Abs
10. Cable Crunch
88.8 mSCORESWAPPED 543 TIMESCable Crunch is a variation on the more standard Crunch. Unlike Crunches, this is a weighted exercise that does not have you laying on your back. Instead of using your bodyweight for resistance, you use a cable machine. This gives you more control over your resistance, as well as more control over the direction that resistance is coming from.
- Beginner
- Abs
- Hi-Lo Pulley Cable
- Rope Cable