A Dyno is a technique, commonly used in rock climbing

Rock climbing

Rock climbing also lightly called 'The Gravity Game', is a sport in which participants climb up, down or across natural rock formations or artificial rock walls. The goal is to reach the summit of a formation or the endpoint of a pre-defined route without falling...

, to use the arms and legs to gain height and distance in a quick, fast, maneuver. It is used to leap from one set of handholds to a higher set that would otherwise be out of reach.

Technique

Technique is a prime factor in the execution of a Dyno, and can be more important than strength. The best way to gain height is to take a single swing and pull hard on the obstacle/handhold, whilst kicking hard off the wall/foothold up in the direction towards the handhold or obstacle you are aiming for. Then reach up and grab the obstacle with one or two hands. For it to be a dyno both hands and feet must come completely off of the wall. The best option now is to place feet on the wall, to avoid falling, but it is possible to hang out without doing so when hands and grip are stronger.