Running over custard is the latest way experts are trying to get kids doing more experiments in the classroom.
Olympic gold medallist Jonathan Edwards ran over a pool of the yellow stuff at the National Science Museum on Monday to show science can be lots of fun.
He didn't sink because the impact from his feet hitting the custard made it act like a solid rather than a liquid.
Experts say not enough kids learn science, and want to get you more interested in the subject.
They're worried not enough kids are learning science, and reckon doing more experiments could make the subject more enjoyable.
A survey of 510 science teachers found two in three didn't have time for experiments, while many said safety rules had put them off.
Bunsen burner
Another survey said that many teachers were too worried about kids misbehaving to do experiments.
So, although you might not be sprinting over a pool of custard, it's hoped you will soon be having a go on a Bunsen burner.