Most hot yoga studios are lit like a car park. One Hot Yoga on River Street is the opposite, a dim and deliberately sensory room where the heat, the finely controlled lighting and the tone-on-tone palette are all part of the practice. Natural materials throughout, heavy linen curtains, a courtyard of greenery to land in afterwards. The darkness is the point. It turns the attention inward and keeps it there, which is what the good studios understand and the fluorescent ones never will. Hot yoga and reformer, run with the same quiet rigour as the design. Elegant, hushed, a little cinematic. You sweat, then you exhale into something that actually feels calm.