Keep speeding
And on that note, yeah, speed is good, so let's maintain it. You can hold the screen to speed down hills, making you go much faster. When going up hill or up awkward terrain, you can tap the screen to start pedalling, which will take you on up, and then stop when you reach peaks. When going off jumps let go of the screen entirely, and then hold on landing to keep the speed you have going all the way.