The Manual on MSN2d
12 fantastic reasons to add jumping jacks to your workout routine
The simple jumping jack or star jump is the perfect bodyweight exercise to strengthen your legs, improve your fitness level, ...
Space.com3d
The next giant leap? How jumping could help astronauts train for trips to the moon and Mars
"Cartilage damage is a really major issue that space agencies need to address despite how very poorly understood it is." ...