Take on the jumping jacks challenge with Ms. AP in this quick 2-minute session. Jumping Jacks Challenge: Take on the jumping jacks challenge with Ms. AP in this quick 2-minute session. Warm up, ...

Jumping jacks in all variations–FITBOOK author Nina Ponath did at least 200 of them every day for 10 days. Here, she shares how it made her heart leap and why she almost gave up. Most of us remember ...