VIDEO : Justin Hartley Flexes His Muscles For A Great Cause

Leave it to Justin Hartley to flex his muscles in the name of charity.
The ?This Is Us? star visited ?The Ellen DeGeneres Show? Tuesday, where the host asked him to plank for a good portion of the interview. The request, however, wasn?t simply to test the 41-year-old actor?s strength, but rather to raise $10,000 through Ulta Beauty for breast cancer research.