Hi, We have made a Metronome for iPhone/iPad that is free to download till the end of May. The metronome has built in rhythm exercises. It would be very interesting to hear what you think of them and the app. If you would like to test this metronome you can get a copy here: Pulse - Metronome on the App Store Thanks!
I downloaded the app but haven't used it yet. Usually my iPhone stays in my pocket and I use my iPad for this kind of stuff.