So i just got 173 blends, upgrading from like 156 chronics. Iim 5'6, 140. The first day, my legs were more sore than usual and my ankle was really hurting at the end of the day. My boots are the same and they've been fine before. Is this just cause im not used to the added weight? I havent worked out legs in awhile either haha. but maybe my boot is a little big? add a sock maybe? the length seems good, just the weight is a little hard to adjust.