The leg-up: Stand in front of your desk and raise your left leg, lifting the left heel towards the buttock. Grab hold of the back foot and hold the stretch for 20 second, stretching the quads 抬腿运动：站在办公桌前面，抬起左腿，左脚跟朝臀部抬。左手抓住后脚坚持20秒，拉伸股四头肌。
