I'm in! I spent years under the misconception that being skinny (but not scrawny) meant I was fit. It wasn't until I started a proper weight/interval training

I'm in! I spent years under the misconception that being skinny (but not scrawny) meant I was fit. It wasn't until I started a proper weight/interval training routine that a) I realized how out of shape I was and b) my lower back stopped being so damned fragile.