If you’re new to HIIT you may be wondering if it's safe for you. The truth is, high-intensity exercise can be a great addition to everyone's workout routine, it's the impact level of the exercises you ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." You’ve probably heard of high intensity interval training (a.k.a. HIIT), but have you heard of high ...

Add Yahoo as a preferred source to see more of our stories on Google. Couple power walking outside in the park on a cold day. (Getty Images) This month we will be alternating between HIIT walks and a ...

For the past decade the fitocracy has been telling us that, as our bodies age, we should be kind to our joints by doing more low-impact exercise. Once again, it appears that a bit of well-intentioned ...