The Towel Raise
The Towel Raise is a great exercise for developing penile strength and rock hard erections. It’s essentially a weighted kegel, so don’t perform this movement until you’ve fully mastered the kegel.
With an erection, place a towel over the end of your penis. Try to lift your towel-covered penis by squeezing the PC muscle (as in kegels.) Start with 20 reps and work up to 100 reps 5 times a week.
As time goes by, you can add weight by using larger towels, or even by wetting the towel.
An advanced technique for Towel Raises would be to hold the towel in the up position for 10 to 20 seconds at a time. You should attempt to work up to 5 to 10 of these sustained repetitions.