Everyone’s invited to roll out their mats on the grass at Yoga on the Mall.

If Teddy Roosevelt were alive today, chances are he’d be doing yoga. Maybe the famously fit president would even be revising his catchphrase to “Speak softly and carry a yoga mat.” That’s the slogan organizers have chosen for this year’s D.C. Yoga Week, which started Monday.

The aim of the event, which features free and $5 classes across the region, is to heighten the city’s awareness of yoga and its health benefits. And no one needs to wield a big stick to see results.

Now in its eighth year, D.C. Yoga Week (Dccy.org) continues to grow, with nearly 40 local studios participating.

Each of them will have a representative at Sunday’s Yoga on the Mall (11 a.m.-1 p.m.), held in Constitution Gardens near the Vietnam Memorial. The representatives will participate in a free, outdoor class — led by local instructors John Schumacher, Patty Ivey, Kevin Waldorf-Cruz and Greg Marzullo — and will demonstrate their different styles by practicing together.

That group session will mark the end of D.C. Yoga Week, but there are plenty more places to take your mat for free classes this month:

-Lululemon’s Yoga in the Park returns at 6 p.m. Wednesday in Dupont Circle. Keep tabs on who’s leading the outdoor classes (scheduled for every week through September) at the Logan Circle store’s Facebook page.

-There’s a style for everyone this summer at the Athleta store in Georgetown (3229 M St. NW). Let Your Yoga Dance, a Friday series starting at noon May 10, is a celebration of movement and music. The following week, folks can try two styles of vinyasa flow and sample a gentle, restorative class. Get the full calendar at Stores.athleta.net/store-4788.

-Yoga is just one of the fitness offerings starting up for the season in Crystal City (Crystalcity.org) this week. The 7 a.m. classes, hosted by Mind Your Body Oasis, are held every Monday through September in the Crystal City Water Park across from 1750 Crystal Drive.

-Beginning May 7, you can wind down at 7 p.m. Tuesdays and Thursdays at National Harbor (Nationalharbor.com). The evening classes on the east pier platform, led by instructors from Sun & Moon Yoga Studio, will have live musical accompaniment. Saturday morning classes with Cathy Valentine begin at 9 a.m. May 11. Both programs will go through the end of October.