Here is a core circuit routine guaranteed to get your abs pumping!
PERFORM PER ROUND:
- 20 sec – Crunches
- 20 sec – Leg Lifts
- 20 sec – Russian twists
- 20 sec – Elbow Plank
Rest 45 sec -1 minute between rounds.
NUMBER OF ROUNDS:
- Beginner – 5
- Intermediate – 6
- Advanced – 7
Your Gymboss Classic Interval Timer makes a perfect HIIT workout timer.
HIIT Day 