Smartass is a new kind of gym with only group training available. The gym has a big variety of class types: from dance classes and yoga to TRX and common functional training (my best is a cycle!). For each class, you should reserve in advance. Keep in mind that the most popular ones are booked a couple of days in advance. But for the most part, you should always be able to find a free place. My friend usually books his morning classes when he stands just near the entrance door. I’m doing the opposite since booked training in advance motivates me to wake up early in the morning and go burn calories.
It is very easy to join, just download their mobile app (the link is on their website), purchase the training in it and book it for the specified time and type of activity. Right now it is one of the best gyms in Kyiv and is not part of a big chain. Even one of our ministers goes there for training, actually, he is one of the cofounders of Smartass.
On the first floor there is also a great restaurant where you could replenish all the calories you have just burned :).