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>(lots of jumping to and fro curbs)
>I want more speed
Sounds like the limiting factor isn't so much your muscles as it is your brain
Ever consider a bike computer? Sometimes "feels like I'm going really fast" is rather different from "going fast". If you just want to feel like you're going fast, ride through gridlock traffic, you'll feel like a badass. If you want to actually fast, obstacles are generally not going to help with that.