Scott Eastwood Compets in South Beach Triathlon

Scott Eastwood put his bod on the line for a good cause in Miami ... raising money, and heart rates of anyone watching him go to work.

Eastwood came dripping out of the ocean, completing the swim leg of the South Beach Triathlon Sunday morning. The 30-year-old heartthrob was part of a celebrity relay team at the event which supported St. Jude's Hospital.

Go ahead, Scott ... make everyone's day.