Ready for a challenge? Grab a medicine ball and try the juggling plank, which might just be the hardest upper body exercise you'll do all week. There’s no easy plank. That’s a fact. Whether you’re on ...
Abs workouts do not need to be long to be very hard, but even so when a video popped up on my YouTube feed claiming to be the "hardest abs workout ever" and it was only 10 minutes long, I was suitably ...
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