Lava Boost
When the player comes into contact with lava they, get burned and mario does a jump. This jump is pretty big and can be used to skip some puzzles or get to places faster. This is also useful for Vertical Speed Conservation as if mario lands on the first frame possible, he gets a big amount of Vertical Speed Stored (80.8). If you are looking for the trick in the volcano, see Volcano Lava Boost.