Is the flat side up harder than the dome side up?

Yes. With the flat side up, the platform can tip in any direction and has to be held level throughout the set, while the dome-side-up BOSU Push-Up only compresses under the hands. Most people should master the dome-side-up version first.

Does this build more strength than regular push-ups?

No. In an eight-week trial with young men who already lifted, push-ups with the hands on a flat-side-up BOSU did not improve bench press strength or push-up repetitions any more than floor push-ups did. Use it for stability and control, and use regular or loaded push-ups when strength is the goal.

Where should my hands go on the BOSU?

Grip the outer rim of the platform on each side, in line with the shoulders, so the hands sit evenly on either side of the center. An even grip keeps the platform level and gives the chest a clear path down toward its center.

What if my wrists hurt when gripping the edges?

Check that the hands are in line with the shoulders rather than out in front of them, which bends the wrists back further. If the discomfort continues, return to Push-Ups on the floor or the dome-side-up BOSU Push-Up until the wrists adapt.

How many sets and reps should I do?

Start with 2 to 3 sets of 6 to 10 controlled repetitions and stop each set while the platform is still level. Add repetitions only when every one stays steady.

BOSU Push-Up (Flat Side Up)

What Is the BOSU Push-Up (Flat Side Up)?

BOSU Push-Up (Flat Side Up) is a compound exercise that primarily targets the chest and also engages the triceps, the front of the shoulders and the core. It is an intermediate-level movement performed with the BOSU turned upside down, so the rounded dome rests on the floor and the hands grip the edges of the flat platform.

Turning the BOSU over changes the challenge. With the dome on the floor, the platform can rock in every direction, and the arms, shoulders and trunk have to keep it level through each repetition while the chest and triceps do the pushing. Coaches generally rank this version as harder than the dome-side-up BOSU Push-Up, because a platform that tips is less forgiving than a soft dome that only compresses.

The instability costs output. In a study of young men with strength training experience, push-ups with the hands on a flat-side-up BOSU were more than a quarter slower and less powerful than the same push-ups on the floor, and the drop was larger in men with no instability training background. That makes this exercise a control and stability drill rather than the best choice for building maximal pushing strength or power.

It suits people who can already perform strict Push-Ups with a rigid plank for several sets and want an extra shoulder stability and trunk control challenge, and it fits well in a warm-up, a circuit or the accessory part of an upper body session. If the platform wobbles out of control, build up with regular push-ups and the dome-side-up BOSU Push-Up first.

Muscles Worked

MuscleActivation

Pectoralis Major: Primary
Deltoid: High
Triceps Brachii (Lateral Head): High
Triceps Brachii (Medial Head): High
External Oblique: Medium
Rectus Abdominis: Medium
Serratus Anterior: Medium
Triceps Brachii (Long Head): Medium
Flexor Carpi Radialis: Low
Upper Trapezius: Low

Instructions

Place the BOSU on a non-slip floor with the dome side down and the flat platform facing up.
Kneel behind it and grip the left and right edges of the platform, fingers wrapped over the rim and hands in line with your shoulders.
Straighten your arms and step your feet back one at a time into a high plank on your toes, with your body in a straight line from head to heels.
Brace your core and squeeze your glutes, then steady the platform so it sits level.
Bend your elbows and lower your chest toward the center of the platform, keeping your elbows angled back at about 45 degrees from your body.
Stop when your chest is just above the platform, without letting it tilt to either side.
Press evenly through both hands to straighten your arms and return to the high plank.
Keep the platform level and your hips in line throughout, then repeat for the planned repetitions.
To finish, lower your knees to the floor before letting go of the BOSU.

Common Mistakes

Uneven grip on the rim
Placing one hand closer to the center than the other tips the platform toward that side on every repetition.
Sagging hips
Letting the lower back drop when the platform wobbles takes the trunk out of the work and strains the lower back.
Flaring elbows
Letting the elbows swing out to the sides to catch a wobble puts the front of the shoulders under extra stress.
Shrugging the shoulders
Letting the shoulders creep toward the ears to control the platform takes work away from the chest and strains the upper trapezius.
Cutting the range short
Stopping halfway down to avoid a wobble turns the exercise into a partial push-up and misses most of the chest work.
Rushing the repetitions
Bouncing through the bottom makes the platform rock harder and invites a slip.

Injuries

BOSU Push-Up (Flat Side Up) is a medium risk exercise when performed with proper technique. The push-up pattern itself is well tolerated, but the platform can tip suddenly under full body weight, and that is where most problems start.

The wrists take the most strain, because gripping the rim bends them back while they also resist the platform rocking. The shoulders are next: when the platform tilts, the elbows tend to flare and the shoulders shrug toward the ears, which loads the front of the shoulder. A sagging lower back is the third common strain point once the core tires.

Check that the BOSU sits on a dry, non-slip floor, grip the rim firmly with the hands in line with the shoulders, and set a rigid plank before the first repetition. Lower only as far as you can keep the platform level, and end the set when it starts to tilt more with each repetition. If this is too hard, go back to Push-Ups, Incline Push-Ups or the dome-side-up BOSU Push-Up. Once it is easy, slow the lowering phase or add a pause just above the platform.

Stop if you feel sharp pain in the wrist or the front of the shoulder, a pinching sensation at the top of the arm, or pain in the lower back. If the platform ever slips out of control, let go and lower your knees to the floor rather than trying to save the repetition.

Overview

Primary Focus: Chest
Equipment: Balance trainer and body weight
Modality: Strength
Difficulty: Intermediate

Alternative Exercises

Frequently Asked Questions

Q: Is the flat side up harder than the dome side up?: Yes. With the flat side up, the platform can tip in any direction and has to be held level throughout the set, while the dome-side-up BOSU Push-Up only compresses under the hands. Most people should master the dome-side-up version first.
Q: Does this build more strength than regular push-ups?: No. In an eight-week trial with young men who already lifted, push-ups with the hands on a flat-side-up BOSU did not improve bench press strength or push-up repetitions any more than floor push-ups did. Use it for stability and control, and use regular or loaded push-ups when strength is the goal.
Q: Where should my hands go on the BOSU?: Grip the outer rim of the platform on each side, in line with the shoulders, so the hands sit evenly on either side of the center. An even grip keeps the platform level and gives the chest a clear path down toward its center.
Q: What if my wrists hurt when gripping the edges?: Check that the hands are in line with the shoulders rather than out in front of them, which bends the wrists back further. If the discomfort continues, return to Push-Ups on the floor or the dome-side-up BOSU Push-Up until the wrists adapt.
Q: How many sets and reps should I do?: Start with 2 to 3 sets of 6 to 10 controlled repetitions and stop each set while the platform is still level. Add repetitions only when every one stays steady.