If you're getting a little tired of the original core circuit, feel free to use the alternative exercises. If you choose to change up the exercises, though, do a few test reps, to be sure you can do the exercise correctly.
- Ab-wheel roll-out
- Medicine-ball twist
- Bird dog extension
- Reverse crunch
Option 1 HIIT
30 seconds work/30 seconds rest for 12 sets, or 1 minute work/1 minute rest for 6 sets
Option 2 Tabata
20 seconds work/10 seconds rest for 8 sets
Once you've completed your cardio workout, you'll move on to the following abdominal circuit workout. Together, these exercises will engage your abdominals, obliques, and lower back.
If you get tired of using this circuit, then feel free to replace some or all of the exercises with the alternatives.