Compressive practice has these three elements:
Isolate the key skill: You put one central skill under the magnifying glass. You aren’t working on the entire set of moves, but just the most important parts — which usually have to do with pattern recognition and reaction.
Pressurize: Make it harder than normal. In games, Cech will never have to deflect three balls. But practicing in this way — forcing nimbleness — will make performance under normal conditions far easier.
Make it Fun and a Little Stupid: These are not “serious-minded drills” — they’re the opposite. They’re funny little games, loaded with emotion, engagement and the opportunity to fail productively. You feel goofy doing them — and that’s the point. This willingness to feel stupid is not a downside: it’s a design feature.
This is Chelsea goalkeeper Petr Cech: