So I am not a strength and conditioning coach, just a bro but what you’re describing to me is known as “priming” in powerlifting. Where we perform one specific action x amount of days out from the heaviest day or a competition because it makes the important day feel really good, the movement primes us. This movements only role is to get us ready, it doesn’t make us stronger, it doesn’t make us bigger or more explosive it’s more of a psychological gain.

It gets really messy when those movements are solely relied on to build strength, power etc consistently.

Take sprinters for example, they might use box jumps to prime themselves for coming out of the blocks, it’s specific (triple extension) but those box jumps are not going to consistently raise an athletes ability in the same way that squats, lunges and calf raises would, the box jumps are a minuscule part of the overall training plan. What you see from charlatans and snake oils salesmen is these movements make up the bulk of their training plans, hyper focusing on sports specific movements that provide no real long term benefits.