It happened at a Real Fitness Gym in Plaza Del Ray, California.
Surveillance video from inside the gym shows several angles of the vehicle plowing through the side of the building.
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Witnesses nearby rushed inside to help anyone who was inside.
Officials say the 35-year-old driver lost control of the vehicle causing the collision. The driver of the truck was transported to the hospital.
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There is no word on his condition or whether he will face charges.
No one inside the gym was hurt.