Accidentally found this in one of my Talkatoo% runs. I'm not sure if this is already common knowledge (I have never seen this before), but it seems that with the right combination of speed and positioning, you can essentially perform a Triple Jump underwater here in Lake, allowing you to preserve your speed well into the water. This could be situationally useful in Talkatoo%, so I intend to lab this out soon.

By executing multiple Motion Control jumps on slopes as a captured Goomba, you can gain speed exponentially. Discovered by Noguy5