May have actually found one of the better uses for the bosu today experimenting with different upper body push plyometrics. Instead of using the bosu for instability, it’s being used here to create a “dampening” effect of kinetic energy. If you’ve ever ran in sand, you know how much harder it is than running on solid ground. While plyometric exercises are typically used to develop elastic strength and the efficient transfer of kinetic energy via the stretch shortening cycle, there’s absolutely no reason why you cannot mix and match training stimuluses to make them more challenging—as long as you don’t get carried away. Always remember what you’re training for!! This same concept and be used on squats and deadlifts by pulling/squatting off thick foam mats. - - Dynamic effort days should constantly rotate special training means to emphasize and develop different qualities. This is very similar to Track and Fields use of surface variability and is the backbone of the conjugate training system. Every time I land on the balls, I sink slightly into them, requiring my muscles to produce slightly more force to propel myself back up. The balls actually do not give me any “bounce back”. If you look carefully, you can see the disconnect (dampening) between landing and takeoff. This may look a little gimmicky, but there’s really not a whole lot going on here. Just a slight tweak to challenge familiar exercises. Remember, when it comes to progressing plyometric or speed exercises , very small modifications can have a HUGE impact. - - If you’re training for athletic performance, you had better apply and have basic science on your side.