Flash Pump

Flash Pump refers to a sudden, intense buildup of lactic acid in a climber's forearms, causing them to quickly feel fatigued and lose strength. This often happens when a climber starts a route too quickly without adequate warm-up, leading to muscle stiffness and reduced grip. In sports climbing and lead climbing, a flash pump can significantly hinder performance and efficiency on a route.

Examples

In lead climbing and sports climbing, a "flash pump" occurs when climbers experience sudden and intense muscle fatigue in their forearms. This often happens early in a climbing session when the climber's muscles aren't adequately warmed up. The flash pump can severely limit a climber's ability to grip holds effectively, making it difficult to progress on the route. Proper warm-up and pacing are essential to avoid a flash pump during climbs.