theres atleast 4 hackers at the top of the crazy star leaderboard, since theres 20 tracks, and you can get 3 stars each, so that makes 60 stars, they have over 60 stars, so thats impossible
to get a high score at the health training: just wait for a while, smash any clocks you see, and when you are running out of time, smash the hamburgers, youll get big combos, thats how i got 106 score without hacking (11 combo :D)