Heisman favorite Sam Darnold threw a perfect pass from a boat to a moving wakeboarder

College football may still be a month away, but many of the expected stars of the 2017 season are spending their offseason preparing.

Some players are in the weight room and others are likely studying game film of their upcoming opponents. But Sam Darnold, USC's star quarterback, has found a different way to work on his timing and accuracy during the summer months - throwing footballs at wakeboarding receivers.

The USC standout and current favorite for the 2017 Heisman trophy posted video of the unconventional training session to his Instagram on Monday.

Darnold took over the starting quarterback position for USC in Week 4 and helped kick-start the Trojans into one of the hottest teams in the country. Behind Darnold, USC topped off the season with a thrilling victory over Penn State in the Rose Bowl.

USC starts its 2017 campaign on Saturday, September 2, at home against Western Michigan. Hopefully Darnold has a chance to get a few throws in on land before then.