What was your reasoning for using hand-drawn type. I quite like the script approach, but it feels better suited to a yoghurt or smoothie or something. For some reason it's giving me soft toy vibes. I think it reminds me of Disney, or Winnie the Pooh or something. That's not to say you couldn't adapt it to work for a fitness club (who may sells their own health drinks maybe…?), but it would have to be for a more light-hearted fitness club, i.e. not a typical gym.
The main issue I see with it is it's very unbalanced. The tagline is very small in comparison and just clashes with the hand-drawn approach.. The M sticks out a bit too much for my liking, and the G doesn't feel like it matches the rest of the type. The 'ee' also feels chunkier than the rest of the text so I'd thin that down a bit. The foot on the 'n' is a bit blobby and just trails off.
I always find it's better to hand draw type like this on paper and use tracing paper to redraw it until you have looking as you want. It's not as quick, but it means you really look critically at every part of the type. But I'd question this 'whimsical' approach is the right one.