Run boost

A run boost is a teamwork maneuver where one player crouches or stands still so a teammate can jump onto their head, reaching a ledge, window, or vantage point that is otherwise unreachable. Some boosts require a running jump off the teammate, hence the name.

Boosts open up surprising off-angles and sightlines that catch opponents off guard, and a few are needed just to access certain map spots. The downside is that two players are momentarily clustered and vulnerable to a single grenade. Many specific boost spots are well known to experienced players on each competitive map.