Given that the heart is a muscle is it possible to strain it ? I was lifting weights the other day and I decided to try something new. 10 reps at a moderate weight (140 lbs) on the bench press. Then take 50 pounds off and do 15 more reps. Three sets of that. No problems while lifting (other than normal fatigue) but the next day and for several days (including today) I've had issues with my heart like its pulsing when I do certain movements (bending over, certain stretching movements, when I first lay down or recline in a chair). Its an indegestion type feeling and only lasts for a few seconds, 15 or so tops. My chest muscles has been sore as well, more than usual when doing something new, but as of this AM thats pretty much a non-issue. Seems the the issue Im feeling that Im attributing to my heart is improving as well. However I bailed out of a 5 mile turkey trot today just trying to be cautious. Im going to give it at least until tomorrow and see how I feel. Just wanted to see if anyone who does weight training has experienced anything like that.