I took a muscle relaxer a couple hours before I worked out tonight and was able to do more then I normally do. Was a flexeril prescribed to a family member that I took to relax some pain in my leg. I didn't workout on purpose with it as I forgot I took it, but I was wondering why I was able to do more situps and push up than normal. I don't feel tired when I take them like most people do but really starting to wonder if I should take one before every work out now.