A flea can accelerate from stationary to reach heights of about eight centimetres in one millisecond. It’s rate of acceleration is faster than a space shuttle!
The flea’s secret is a stretchy rubber-like protein which allows it to store and release energy like a spring. This enables its hind legs to snap when pushing the flea upward with a force sp strong that the flea experiences 100 G. a space shuttle peaks at around 5 G.
Source: Commonplace Fun Facts