Kellan Lutz & Bryan Greenberg Work Up a Sweat at NFL House

Kellan Lutz and Bryan Greenberg sandwich in Katrina Bowden while attending the Flywheel Challenge on Friday (January 31) at the NFL House in New York City.

The Flywheel Challenge was a month-long program where cyclists had a chance to earn points to win prizes and help raise money for The Snowflake Foundation.

PHOTOS: Check out the latest pics of Kellan Lutz

“These two were good competition @bryangreenberg @kellanlutz 🚲✌️,” Katrina tweeted after the event to which Kellan replied, “I need to cycle more…”

“I just rode @Flywheel #rideforsuperbowl48 Great workout for a good cause,” Bryan tweeted.

40+ pictures inside of Kellan Lutz and others at the event…