Based off of season 1 ep: 6

Scott hasn’t been a werewolf for long and he needs to control his anger so he wouldn’t turn in front of people and so he could control his turning better. During your free period you, stiles, and Scott all walk into the lacrosse field. Once you get there stiles puts a heart monitor on Scott and duck tapes his hands together. Scott then walks in front of the net and stiles starts chucking lacrosse balls at him with his lacrosse stick