According to director Christopher McQuarrie, Cruise and his training team were doing "30 jumps a day" eventually totaling over 500 skydives as training for Mission: Impossible Dead Reckoning Part One.
Mission: Impossible – Dead Reckoning Part One (yes, it's gonna be a two-parter!!) is the seventh installment in the Mission: Impossible film franchise. And in case you're wondering if it's gonna be any good...well, it currently has a 99% on Rotten Tomatoes.
I have seen the film and, can confirm, it's pretty great and definitely worth watching on the big screen. Fun? Check. Action-filled? Check. Does Tom Cruise run A LOT in it? Check! Check! Check!