If you've been working out for a while and you're ready to push yourself a little harder, try this advanced ab challenge from Kayla Itsines, certified trainer and creator of the Sweat ap. It includes these five bodyweight moves:
- Commando: 12 reps
- Extended plank: 30 seconds
- Ab bike: 40 reps (20 per side)
- Straight-leg jackknife: 15 reps
- Russian twist: 30 reps (15 per side)
Kayla said in the caption, "Save this video and try it next time you workout [sic] and are feeling strong!" These moves may look simple, but when you get on the floor and actually do them, they're intense. Looks like you're going to have a sore core tomorrow!