Sit-ups are an all around great exercise to develop and tone abdominal muscles. Working on core muscles can help to supercharge other workouts and improve balance. Here's how to do sit-ups, brought to you by Specialty Athletic Training.

1. Start in a full plank position with palms on the BOSU ball and hands in line with your shoulders.
2. Brace your core.
3. Drive your right knee towards your right elbow.
4. Pause at the top position and reverse back to starting position.
5. Continue alternating between legs for the prescribed number of repetitions.

Ryan Lockard, CSCS, CFNS, is the head trainer and founder of Specialty Athletic Training. He is accredited by the National Strength and Conditioning Association ( NSCA) as a Certified Strength and Conditioning Specialist, as well as by the International Sports Science Association ( ISSA) as a Certified Fitness Nutrition Specialist. Ryan has worked with individuals with special needs since 2007 and has over 10,000 hours of 1:1 instruction working with individuals that have various special needs.