After achieving erection, place a small wet towel on your erect penis. Move this towel up and down. You can increase the size of the towel. Some men even use sandbag weights. A participant in one of our workshops told us that young men in his high school held locker room contests to see how many towels they could lift.
Women can work with cylindrical objects that provide solid resistance.
Use the power of visualization to increase affectiveness. The great bodybuilder Arnold Schwarzeneger worked out using precise mental images to guide the growth of his muscles. Women can see their vagina as a tunnel made up of several muscular bands that can contract or expand at will. These circular bands of muscle are seen growing in size and strength with each contraction. Men can imagine that the PC muscle is a steel cable running between their legs which they can tighten or loosen at will.