I stay pretty active and go to the gym regularly. I do things like walk miles uphill on the treadmill, squats, lunges. So my body is use to exercise but today I went to the gym and only did the treadmill and all day my left leg has been in throbbing pain from my mid thigh down to my calf. Also, hurts inside of my knee of that leg as well, which isn’t unusual since I’ve already had knee issues there to begin with because of an injury back when I was 14. But this thigh pain is new. It’s on the inside part of my thigh and feels like the muscle. Can barely put any pressure on that leg cause it hurts so bad. As long as I lay down and do not move the leg at all, it doesn’t hurt nearly as bad. What could be wrong?? Took a hot shower and rubbed it. Hurt while rubbing it but also felt good.