Do the following four days a week:

3x Side crunches (12-15 each side and weighted)

3x Jacknives (8-12 and weighted)

3x Crunches with feet up (8-12 and weighted)

Rules

Challenge yourself

Du oppdaterer denne utfordringen manuellt her.

Challenge is between 2013-09-30 og 2013-11-03.