We received tremendous feedback from participants in The Wall Street Journal Fitness Challenge, a six-week program developed by Arnie Kander, an NBA sports performance coach. Haven’t signed up yet?

Master the ab wheel rollout with our step-by-step guide to proper form, expert cues, and building a bulletproof midsection.

Plus, which move is more effective for strong abs.

Add Yahoo as a preferred source to see more of our stories on Google. Using proper form while exercising improves performance overall and lowers the risk of knee or back pain. (Getty Images) (vitapix ...

You’ve probably heard that running with the right form is paramount if you want to perform well and avoid injury. The same concept applies to any exercise across the board. But while you’ve probably ...