Hill House

Hinge Fitness

House 403

Inclusive Fitness

InnerCity Weightlifting

Institute of Combative Arts Quincy

Instrumental Yoga

Intuitive Wellness

JBSC

JET Boston

JKA Revere Athletic Club

JP Centre Yoga

Jazzercise

José Mateo Ballet Theatre

K Foley Global Pilates

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 - SharkNinja

Kinema Fitness - Wolverine Worldwide (MA)

Kinetic Dance Studio