So I'm trying to build up my arms and abs been working out for a month . Had asthma as a kid never really cared for lifting. Anyways I work full time in construction so my workout us at home after work. I usually lift dung bells start off with reps of 15 lbs and then switch over 25 the highest weight I have. My workout usually last about 2 hours that's including the p90x and fat burner cardio workout they have on this app...my question is how often should u be working out my arms currently I work out Mon - Thurs also any advice on max reps I should be doing to see results?