Stressed out? This quick but effective Tabata challenge will get your heart pumping and endorphins flowing. Tabata is a form of high-intensity interval training (HIIT), explains Chapman.

Tabata, a style of training rooted in short sharp sessions completed at maximum effort is here to save the day, er, week, er, ...

Because Tabata can be done with any kind of activity, and the intensity is about hitting your personal max, it's infinitely adaptable. "At any age, if I want a challenge, I could sit on a recumbent ...