2-Week Plank Challenge: Build Up to a 5-Minute Plank
Plank is one of the most effective and better full body exercises , so here's a new challenge for you to conquer a five-minute plank: ...
http://fitnecessaries.blogspot.com/2015/02/2-week-plank-challenge-build-up-to-5.html
Since holding a straight-up plank wouldn't be any fun (and could end up causing an injury), this challenge mixes up five basic variations to not only tone your abs and arms, but to target the obliques, legs, and upper back as well. Here's an explanation of how to do each one, followed by the two-week plan.
