Weak wrists surprise you. You pick up a weighted bag or attempt a plank, and before you know it, everything is wobbling.

Some calm waters hide a shark that can leave the ocean and push deep into rivers, following routes most predators cannot. We trace how bull sharks survive the freshwater challenge, why juveniles treat ...

What happens when you commit to 200 push ups every day for 30 days? In this video, I put that question to the test with a no-excuses bodyweight challenge. From sore arms to surprising gains, I share ...