Thank you, nelie
I was using 3-lbs, but I recently switched to 4's. When I get to about rep 8, it gets harder for me to lift them. The 3's were getting too easy, and 1 pound may not be much to some people, but it is somewhat of a challenge as I get higher into my reps. I do plan to go to 5, then 8 eventually. And yes, my purpose is to build muscle. I have been doing them every other day, but lately I feel like if I skip a day of something, then I am cheating myself of exercise I could have done. It is good to hear from someone else to have rest days.
Thanks, again!