And so it begins.

Let the free outdoor fitness classes begin!

In the summer, the city of Boston turns into an outdoor gym—a free gym—with many parks and organizations offering classes that rival any paid studio. The Esplanade Association is the first to announce its free fitness lineup for the summer of 2015. The beloved park offers five miles of pathways, five docks, three playgrounds (each designed for a specific age group), exercise courses, Fielder Field, the Hatch Shell, Teddy Ebersol’s Red Sox Fields, tennis courts, and the BU Sailing Pavilion and Community Boating. Everyone in the city is a fan—even Gisele’s Instagram feed is filled with Esplanade shots.

The Esplanade Association’s free fitness series is called, “Healthy, Fit & Fun.” It launches July 9 and runs through September 19. It will include a run club, Zumba at the Hatch Shell, and yoga and CrossFit at Fiedler Field. Last year, more than 5,000 people participated.

Below, a breakdown of what to expect:

Zumba

When: Begins July 14 and runs every Tuesday at 6 p.m.

Where: The Hatch Shell

Why: Fusing Latin rhythms with interval training, these all levels classes get you moving to fun beats. Classes sponsored by Healthworks. Refreshments provided by Zico and CLIF.

Sunset Yoga

When: Begins July 15 and runs every Wednesday at 6 p.m.

Where: Fiedler Field (Arthur Fiedler Memorial Head)

Why: Yoga with river views and a sunset. Enough said. All levels welcome. Classes sponsored by Athleta. Refreshments provided by Polar Beverages and CLIF.

Run Club

When: Begins July 15 and runs every Wednesday at 6:30 p.m.

Where: Marathon Sports Boston (671 Boylston St.)

Why: Runners of all ages and levels are welcome to meet and then choose between a three, five, or eight mile route. This run club is led by Marathon Sports.

CrossFit

When: Begins July 16 and runs every Thursday at 6 p.m.

Where: Fiedler Field (Arthur Fiedler Memorial Head)

Why: CrossFit doesn’t have to be intimidating and these free classes will show you why. This program is designed for people of all fitness levels. Classes sponsored by The Reebok Foundation and led by Reebok CrossFit Back Bay. Refreshments provided by Polar Beverages and CLIF.

Stay tuned for updates when the rest of the parks and organizations announce their lineups. There’s still time to sign up for Boston Sports clubs free fitness classes that are running through June 24.