do sit ups

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Three-quarter view of a shirtless afro man making push-ups on a gym ball

Three-quarter view of a shirtless afro man making push-ups on a gym ball

Side view of a shirtless afro man doing crunches

Side view of a shirtless afro man doing crunches

Three-quarter view of a shirtless afro man standing in plank on his elbows

Three-quarter view of a shirtless afro man standing in plank on his elbows

Side view of a shirtless afro man making push-ups

Side view of a shirtless afro man making push-ups

Three-quarter view of a shirtless afro man making push-ups on a gym ball

Three-quarter view of a shirtless afro man making push-ups on a gym ball

Side view of a shirtless afro man doing crunches

Side view of a shirtless afro man doing crunches

Side view of a shirtless afro man doing crunches

Side view of a shirtless afro man doing crunches

Front view of a shirtless afro man stretching while sitting on a green gym ball

Front view of a shirtless afro man stretching while sitting on a green gym ball

Side view of a shirtless afro man standing in plank on his elbows

Side view of a shirtless afro man standing in plank on his elbows

Front view of a shirtless afro man stretching while sitting on a green gym ball

Front view of a shirtless afro man stretching while sitting on a green gym ball

Side view of a shirtless afro man making push-ups on a gym ball

Side view of a shirtless afro man making push-ups on a gym ball

Three-quarter back view of a shirtless afro man doing crunches

Three-quarter back view of a shirtless afro man doing crunches

Three-quarter view of a shirtless afro man making push-ups

Three-quarter view of a shirtless afro man making push-ups

Young woman lies down with raised leg

Young woman lies down with raised leg

Side view of a shirtless afro man doing crunches

Side view of a shirtless afro man doing crunches

Young woman with book looking at camera

Young woman with book looking at camera

Front view of a shirtless afro man making push-ups on a gym ball

Front view of a shirtless afro man making push-ups on a gym ball

Side view of a shirtless afro man making push-ups on a gym ball

Side view of a shirtless afro man making push-ups on a gym ball

Front view of a shirtless afro man sitting by the treadmill

Front view of a shirtless afro man sitting by the treadmill

Young woman lying down with book

Young woman lying down with book

Young woman with raised leg

Young woman with raised leg

Side view of a shirtless afro man doing crunches

Side view of a shirtless afro man doing crunches

Front view of a squatting dark-skinned young man raising hands

Front view of a squatting dark-skinned young man raising hands

Three-quarter back view of a shirtless afro man standing in plank on his elbows

Three-quarter back view of a shirtless afro man standing in plank on his elbows