Trainer Kelly Matthews created the '30 Realistic' Challenge to help people build healthy, sustainable habits. Here's how to ...

There's no shortage of TikTok fitness challenges involving numbers that people have been loving lately – the 3-2-1 method, the 12-3-30 workout, the 25-7-2 Stairmaster workout – you get the idea. The ...

Add Yahoo as a preferred source to see more of our stories on Google. A fitness challenge can keep exercise exciting so you avoid a dreaded January plateau. (Getty Images) (mapodile via Getty Images) ...

Learn how to train smarter, not harder, and see real progress in your fitness journey.