To keep our mobility intact beyond Sixties into our Nineties, we need to start building up quadriceps (Front of thigh) and hamstring muscles (Back of thigh) right from childhood. To keep them in trim with age, we need to do the following exercises regularly within the framework of staying power and comfort levels.…………………………………………………........Weak Inflexible Sluggish Quadriceps…………………………………………………...