I can't really tell you much about the Fitness Center other than it has lots of flashy equipment that, err'..ummm...due to my bad back (yeah, that it) I was unable to try out.  What I can tell you is that Seabourn has invested heavily to make sure it has some of the best equipment as sea.  (FYI, there is no designated jogging track onboard, but I believe you should be able to make due early in the morning...if the treadmills are not sufficient.)

The Kenisis Wall