Now Playing: Wind down your summer with this five-ingredient watermelon margarita

Now Playing: This guy made watermelon pizza, and we are unsure how to feel

Now Playing: How an Olympic climber manages her anxiety to get in the zone | FiveThirtyEight

Now Playing: West Virginia offering incentives to remote workers looking to move

Now Playing: Doctors in high-transmission areas stuck in the middle of mask debates

Now Playing: Federal Reserve keeps interest rates unchanged in highly-anticipated decision

Now Playing: Redo vote on bipartisan infrastructure deal could come Wednesday night

Now Playing: The Breakdown: Key vote on bipartisan infrastructure deal could come Wednesday night

Now Playing: Biden touts American manufacturing, infrastructure deal

Now Playing: These fast toddlers are headed to the Olympics

Now Playing: Meet the 1st female Arab-American NASCAR driver

Now Playing: Amy Robach’s Olympic update on US swimming gold, Simone Biles

Now Playing: Capitol officers give emotional testimony about Jan. 6 riot

Now Playing: What you need to know about the CDC’s latest mask guidelines

Now Playing: Robin Roberts on her show ‘Turning the Tables’ and Simone Biles’ Olympics withdrawal

Now Playing: Capitol Police recount horrors of Jan. 6 insurrection

Now Playing: What you should know about wildfires

Now Playing: ABC News Update: CDC urges masks indoors even for vaccinated Americans

Now Playing: What’s next for Simone Biles after pulling out of 2 events