JET Boston

JKA Revere Athletic Club

JP Centre Yoga

JV Fitness

Jazzercise

Jessi’s Virtual Workouts

José Mateo Ballet Theatre

K Foley Global Pilates

K-FIT Studio LLC

Kaivalya Bodywork

Kaliyuga Dance Studios

Katana Spa

Kinema Fitness - 55 Fitness

Kinema Fitness - One Post Office Square

Kinema Fitness - Rowes Wharf Health Club

Kinema Fitness - Wolverine Worldwide (MA)

Kink Pilates

Knights Of Columbus - Newton

LS Flamenco

Lea Tam Acupuncture

Level Ground Mixed Martial Arts

Level Up Fitness and Wellness Center

Lexington Power Yoga

Lifted Fitness + Performance