Summer is just around the corner, but for those who can't wait for beach season, there's always indoor surfing.

Crunch Gym in Fort Greene offers "Surfset and Sun" classes, which are free to its members. The 45-minute class combines balance and cardio to help people get a surfer's lean physique.

The workout can burn up to 500 calories depending on intensity level.

It can also help build confidence in people who have never stepped on a board before.