For all nerve flossing exercises, try to stay at a 3/10 level of tension where your extremities don't go numb. This might feel scratchy or zinging. Gentle and small doses make the best change over time for these. With your opposite leg bent (high hamstring tightness) or straight (for more flexibility), hold the back of your thigh. Slowly extend your knee to the 3/10 tension point, then bring your toe toward you, again to 3/10 tension. Let your foot and knee relax and repeat up to 10 times. Repeat on the other side. For the sciatic flossing portion, you may feel this in your hips or somewhere else. With opposite leg extended, move to the comfortable end range of your hamstring, then oppositely point and flex your toes up to 10 times. Repeat on the other side.