I didn't know about Studio KO until I signed up for a package at Studio Lagree (situated on the same floor); At first, I was skeptical as to how good of a work out it would be as I had previously experienced intense boxing cardio-style classes at Fit Factory and also because Studio KO's space/room is quite small. However, this is one of the BEST workouts I have ever experienced in the city and I love how boutique/ small the classes are. The instructors are really helpful and the experience is always fun, despite painful. The lights/effects add to the experience. It's not cheap but results come fast.
*wraps mandatory
*you can rent gloves for $3