I know, Dr. Stephen makes everything look easy, but this variation of the “Crunch” is a core builder. Alternate with sets of push ups, squats and pull ups for a total body workout (sets of ten each for 4-5 rounds, no stopping).
- Lay flat (or balance on a box for a challenge)
- Tuck your knees and chest upwards to meet
- Return to the flat position.
- Repeat
