Vibrating muscles

Description: I am sitting on the couch in short denim shorts, with bare legs and sneakers. my feet are on their toes and my heels are lifted off the floor. i am bouncing my legs quickly so that my heels never touch the ground, and while doing this, my muscular thighs are trembling. my muscles and my entire legs are bouncing up and down. then, i alternately tap my feet on the floor, lifting my toes completely off the ground. i do this quickly and rhythmically, gradually increasing the intensity. my legs are vibrating and bouncing. my thighs are on fire.