Due to heart condition, my cardiologist says I must limit my arm lifting to no more than 50 lbs. She says I can lift more with my legs and such but not (pull or lift) more than 50 lbs.. I am 64 years old, I do train in boxing and karate still and have noticed strength increase from just hitting the heavy bag. I want to increase my arm and shoulder strength so I can handle things heavy at home easily like the ladder or tiller or pouring concrete. Cardiologist says I can just do more reps with a lighter weight. I thought that would just add bulk but not much strength. I do not want bulk. Any advise on how to increase my arm and shoulder strength without going over the 50 lb limit? Oh yeah, watch what you eat. I worked out hard all my life but my bad diet has given me this future.