I'm going to be adding these to my routine..

I have a machine at my gym that I tried out today..

The bar is on a machine that goes straight up and down..

Is it ok to do these for the first little bit, or am I being too much of a pussy?

I feel I can concentrate more on getting my bum out and going low if I don't have to worry about falling over backwards..

Thoughts?

Very hard on my upper back, and my rotator cuffs!! :(

Damn! And that was just 100lbs!!