My wife just had our first baby in Nov, and now how has bad tennis elbow. I am going to buy her a thera-band flexbar, but have no idea what size I should get her. She is a 3.0-3.5 player, an ex-competitive figure skater, 5'1", about 150 lbs, pretty strong compared to most women. I am thinking of getting the green one, that takes 15 lbs of force to twist (there is also the red one that takes 10 lbs, and the blue one that takes 25 lbs). I would also like to use too, but hopefully I won't ruin it, I am about 240 lbs and 5'10". I think the green one would be a good compromise, and then we will get the blue one if it is too easy. What do you all think?