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Just a Skinny Minute
Just a Skinny Minute- Plank Challenge
Advanced Crunches Challenge
crunch challenge | Tumblr
Beginner Crunches Challenge
Plank challenge...See what happens to your body after you try this challenge. Seems doable.
We could all use a little challenge now and then. :-)
Just a Skinny Minute - pushup challenge
The Core Challenge