When our older kids are conditioning, which they do have to do in order to get better, we constantly remind them that this is to make them better and make their routine easier in the long run. We're super lucky to be partially partnered with an elite training centre in our city that works with NHL, CFL and olympic athletes and they're currently training all our coaches who are on Team Canada/working towards Team Canada. It's changed our entire outlook on conditioning and training.
If things aren't hitting, its our job as coaches to figure out why and adjust accordingly. Doing 1000 jump squats and 7 hours of wall sit won't make things hit, it'll make kids angry, upset and exhausted. I've never understood attaching a negative emotion to something that they *need* to do in order to get better. There's a difference between conditioning instead of stunting because kids are unfocused, since stunting unfocused can lead to injury, and conditioning because your full up fell for the 4th time and I'm livid.