My muscle feels tight?

Recently i've started doing the Insanity workouts, i'm not obese just a chub it's my third day on the program and im noticing its hard to do the workouts im on, involves lots of bouncing and such and my calf muscles on both legs feel kinda tight and...

For about the past week, with varying intensities of pain, the calf muscle in one leg has been sore and feels taught, almost like it's suddenly not long enough and being pulled to tight. Some days it's been just a dull ache that I don't really notice...

the molar isnt very numb, just slightly, and i also have 2 canker sores under the same molar. i am worried it might be a problem with my tooth, or is it just radiating pain? to be exact i pulled the muscle yawning, and then got two canker sores. the...

ever since i vomited violently, it seems as though i pulled the muscle, and now my erections seem weaker and the area is swollen, but only during erections. help/?advice?

for the last few days i have noticed what i can only describe as what feels like my lower abdomenals contracting, it feels as tough they are being pulled closer together for a few seconds and then being released again. i have also noticed my abdomen...

You know when sometimes the inner sole of your foot gets stretched out funny from walking and the muscles feel extremely tight, stretched out, and susceptible to snap even? Well I have that muscle pain feeling in my left thigh (sometimes it trickles...

A muscle tear b sea water diffusion in muscle c lactic acid accumulation d bite of pirranahs