Strong thighs, powerful calves and indefatigable stamina. Soccer players are famed for many things, but upper-body posterior endurance is possibly not something you’d expect they need to ply their ...

Watch me push through the pull-up challenge even when I think the song is over! Fitness challenges like this test endurance and determination. Join the fun and see how many pull-ups you can do!

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Ever dreamt of nailing that first pull-up (no band...no machine...) but ...

Partner workouts -and even better, partner challenges-help you get that extra dose of motivation. That's why we were grateful when Solace and Reebok trainers Kenny Santucci and Chelsea Potter showed ...