6
votes
1answer
374 views

Dumbbells and barbells: Where is the center of gravity?

(Assume we're near the Earth's surface, so that center and gravity and center of mass are basically the same.) I've heard that the "center of gravity is not fixed when there are two pivot points as ...
1
vote
3answers
2k views

What are good dumbbells or barbells for P90X?

I'm looking to buy a barbell/dumbbell set to start doing P90X again. I came across the Bowflex and the Powerblock adjustable sets, but they just seem so freaking expensive ($300 to start for each). ...
14
votes
7answers
8k views

Why aren't stiff legged deadlifts bad for your back?

It seems to me they go against everything safe about lifting! Lifting with your lower back and not your legs. Image source Anyone have any thoughts on the safety and science behind them?