how often should someone add wieght to wieght bar or dumbell to get stronger?

Answer 1

When the old weight is no longer a challange.

Answer 2

Depends how you lift. if you pyramid, like reps of 10,8,6...then not often..you do that for a couple months and then you do 3 sets of 10 reps but with the weight you used to do 6 reps on.

if you just do a few sets of 8, then probably once a month or so. you want to make sure that when you start liftin a weight, you can only get to your desired rep, and no more. it should be almost imposibble for you to get ther. and you stick with that for a month. when it becomes easier, you add about 5lbs a side and do the same.

Answer 3

For strength, it is more HOW you lift than how MUCH you lift.
Remember, slow abduct and adduct reps. with a tolerable weight for strength and faster ones for bulk.