how hard to hit a heavy bag?

[Snakey]

I'm kinda curious... how many people here can hit a normal heavy bag as hard as they can?

For me... Jabs aren't a problem, but with a power punch like a right cross or hook with all my body weight behind it, I'd seriously hurt myself (wrist, hand injury most likely). I bought a 70 pound Everlast Nevatear bag about a month ago for exercise and stress relief. I know that I need to work on my form and give it time, but I don't remember ever having to hold back when I was younger. I'm in my early 20's and weigh about 240 pounds so it's not like I'm in really bad shape or too old to hit a heavy bag.

Mate are you wrapping your hands properly? I found my wrists got sore when i didnt wrap my hands and wrists.