One practice tool they can use to do this is called a "Metronome" it is available FREE on google, app stores and even smartmusic. The metronome keeps a steady beat for you so you can practice with it.
We watched this AMAZING piano player as well - he keeps a steady beat with his foot on the piano. The students would like you to note: this piano has been specifically altered to handle his foot doing this - doing this foot technique on a "normal" piano would break it.
It is a super cool piece and we wanted you to enjoy it as well!