I remember reading the recommendation from Patrick Walsh's book about Kegel exercises, which is why I started out doing them that way. When I mentioned that to my urologist, she said it can lead to bladder problems later on.
I checked on the Internet and some medical authorities recommend to Kegel while urinating, others advise against doing Kegel exercises while urinating.
And the ultimate medical authority, the Depend underwear folks, say on their web site not to do Kegels while urinating. Guess it all "depends" on who you ask. The "bottom line" is to do them.
Like the old Gershwin tune has it, "You say po-tay-to, I say po-tah-to."