I use to be the same way, I used little 8 oz gloves that came with my heavy bag. But after a while my wrists and knuckles started hurting, so I went and bought a pair of 14 oz gloves that I now use with the heavy bag. For me, there was a huge difference when I first started using them, I noticed me dropping my hands and my shoulders would start getting sore so much faster than usual. Now I am use to them of course but it most definitely builds endurance/stamina. The 14 oz gloves also help prevent my wrist/knuckles from hurting too, unlike the little 8 oz. gloves did.