Mid 50s. I was doing a lot of gym daily with just toning on machines. No heavy lifting. Everything was great. The gym was far away so I took a little time off. I have a pull up bar, captains chair, push up thingy in the garage. I never do full pullups at the gym but will do the assisted ones where 70% of my weight assists using the weights on pull up machine. I was mainly stretch to do pull ups but with no weight at home. I was not warmed up. Really just doing stretching. A few days later pecs hurt and then back muscles like delts and traps also hurt. Walking was even sore. I am smoking no weed etc. Even breathing was labored. I have taken it easy and have do very gentle stretching exercises but after a month it is still sore. I tried mowing the lawn and that was rough. Any suggestions? I have watched some doctor and physical therapy videos. I take plenty of supplements and also started back on muscle milk type of shakes mainly for amino acids in them. I had heard that guys 50 and over are prone to these types of tears. I think my situation was more a strain. Always warm up and don't make the mistake I made. Thanks for any help.