The burpee: it's an advanced move to master, and one full of many different parts that might, if you're not careful, put strain on your wrists and knees. First, there's squats. Then, there's the ...

Once again, 30-day fitness challenges are all the rage on social media. Whether it's a family workout challenge, a flat-abs-in-30-days challenge, or a popular 10-minutes-of-yoga-a-day-for-30-days ...