I've been exercising almost every day since just before new year and I've never felt so weak! I don't have half the strength or stamina I had when I first started. I've been doing a combination of yoga and pole fitness classes. The first week I felt a bit sore but now both arms feel like I've been given a 'dead arm' and I can barely lift them. Today in pole class I felt something pop in my upper abdomen as I was lifting myself and now it hurts to cough or sneeze. I feel so old 