I found some of the best Squarespace Fitness templates to kick-start your website.
Alignflow
Cole
Colima
McCurry
Matsuya
Organic Matter
Ortiz
Tepito
Idrah
Soony
Souto
Amal
Vivid Glow
Reseda
Mycelium
Mosley
Talva
Visual Smiles
Gilden
Dalya Rayne
Fit BTQ
3D Burn
EJ Fit