Crab crawl relay race
Split your cubs into two teams, and have them race each other doing the Crab Crawl.
Mark a starting point and a turning point use cones/markers.
Each crab crawls to the turning point and back then tags his teammate to start his turn.
Doing the crab crawl isn’t as easy as it seems. For younger cubs, don’t put your turning point too far away.
Otherwise, you run the risk of them getting tired and not being able to get back to the starting line!