thighmaster, or any excercise the provides resistance while squeezing your legs together.the most efficient way is to keep your body completely parallel, lying down being the simplest task.
-cremasteric muscles -pubococcygeus muscles
In females, these muscles are separated in the middle by the vagina and act to constrict the vaginal opening.
(Strengthen your muscles)
bulbospongiosus, external urethral sphincter, extrernal anal sphincter, Gluteus maximus, iliococcygeus
Strengthen your abdominal muscles.
To get your legs to strengthen by running and running because this is using your muscles and that helps your legs to strengthen.
The exercise ball will strengthen different muscles depending on how you use it. It's probably most popular and frequently used for an abdominal work out.
When exercise is done the muscles are broken down. The muscles are then repared back stronger.
Strengthen weak muscles and stretch shortened muscles.
Some good ways to strengthen your knees would be to perform exercises which would strengthen the muscles around your knees. Low impact sports would help to build muscles on your knees as well.
In men, Kegel exercises can strengthen the muscles that support the erection, in addition to helping with urinary incontinence and other medical problems. These are strengthening exercises that involve contracting and releasing of the muscles between the scrotum and anus (the muscles involved when you are starting and stopping the flow of urine or when you are "holding in" urine or feces) which are called the PC muscles or the pubococcygeus muscles. The exercises are done in several sessions of multiple repetitions daily.Kegel exercises are used for treating male incontinence, premature ejaculation, erectile dysfunction, prostatitis and swelling from prostatic hypertrophy (BPH).See the related questions below for more information and links.
http://www.nismat.org/ptcor/lbp/