Yesterday was the second day straight in a gym since my ACL injury (Sept 2014). I over did it the first day by doing "back" exercises. Usually, when I tweak my back and can't bend over, I have to squat in order to compensate. Unfortunately, I did "legs" on the second day so I wasn't able to bend over or squat today. It's feeling better this evening and I'm excited to be working out again and look forward to working out again tomorrow and Monday.