Sometimes in life, you really can't beat the old stuff. Old friends, old tunes, old movies - we love them all. And when it comes to working out, it seems we're partial to going retro too: indoor step ...

High-intensity interval training, or HIIT, is a great way to get in a fast, effective workout. This quick routine is helpful ...

In TODAY.com's Expert Tip of the Day, personal trainer Stephanie Mansour reveals whether a gym membership or working out at ...