Jennie
Do you have kids?? If so lift them as much as possible, making sure to switch arms often as you do not want to be lopsided....If you do NOT have kids of your own, get someone elses and do beforementioned as often as possible...Try to find kids 6 months and up....10-20lbs...(hehehehehe)
lol...Sorry, thats what I do...except my left arm is stronger than my right...but, what I can say is my arms have never looked so good....hahaha, even my mom said she wishes she had my arms, and she would NEVER say anything like that to me....(meaning the kid lifting must work)
Good Luck!
Leanne