Plank Challenge - Free exercise app.
A training program of 5 weeks.
After 5 weeks you're able to make the plank for 4 minutes.
An intensive strength training program that strengthens your core body.
Challenge your friends on Facebook or Twitter.
A training program of 5 weeks.
After 5 weeks you're able to make the plank for 4 minutes.
An intensive strength training program that strengthens your core body.
Challenge your friends on Facebook or Twitter.
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