Who doesn’t like the idea of limited time to get stronger? This idea of rhythm interval training is from the website Climbstrong.
“Rhythm intervals are a fast and utterly effective tool in building strength-endurance and endurance for hard rock climbing. This might be the best thing going for a climber that’s got limited space and limited time, but still wants to be able to hit the high grades at the crag.”
They have several other videos demonstrating different training techniques here.