Jillian Michaels plank challenge says day 30 5 minutes ... I just can't imagine being able to do half of that

Any completed it, does it work if you start of weak

Not all of them are so long but even if you go for more extreme anything is better than nothing ... I should maybe do the challenge for work so I'm doing something!

Squat challenge
Plank challenge

... Wonder what else there is!

Plank is very very tough….! But it is very beneficial for all body fitness.