By A Mystery Man Writer
A medicine ball adds variety and intensity to the classic situp. Only add a medicine ball once you've mastered the standard version.
How to Use a Medicine Ball for Sit-Ups
Medicine Ball Sit-Up Guide: How to Master Medicine Ball Sit-Ups
How to Do Sit Ups With an Exercise Ball: 10 Steps (with Pictures)
5 Partner Exercises That Will Turn a Workout Into Date Night
Abs - Stability Ball Sit Ups by Saranyapong T. - Exercise How-to
Performance Fitness - Medicine Ball Overhead Sit-ups!!! Learn how
19 Best Medicine Ball Workouts for Beginners (Step by Step)
5 Exercises to Do on an Exercise Ball—from Easy to Advanced
File:Weighted sit-ups on an exercise ball.jpg - Wikipedia
7 Partner Exercise Routines! -GymLion