Reverse kegels are necessary cause they provide that you dont get unbalanced in your pelvis.
The goal is to be in control over them to use them when necessary. A strong kegel muscle itself can lead to premature ejaculation cause its the muscle the cotnracts when cumming.
The reverse kegel is when you push urin out while pissing opposite to the kegel that stops the pissing.
When you do the reverse kegel first you probably use a big part of your abs too. You should feel the push in the base of the penis. Its pressure down there.
At first it feels like shitting and when you press too hard it may happen lol.
Try to feel the push towards your dick with regular kegels as with the reverse kegels
The goal is to feel the difference between normal kegels, reverse kegels, total relaxation down there and when it does what during sex,masturbation.