Well, when I see others doing some real heavy lifting I am impressed. I use light dumbells (10 lbs X2) and kettleballs (15 lbs X 2) so I feel that is 1/2 of what most others are doing. I am not looking to bulk up. More to be toned and maintain some strength and endurance.

One other thing to do - I hold the weights at my side inbetween exercises - so I might be holding them for 10 minutes or more before putting them down for only a short time. I find this really works out my arms.