The cache is a whey protein supplement container, with cache log container inside, about 12m up a tree.
I prefer to think that "the world is my gym", especially as lugging climbing gear several hundred metres, then climbing to the canopy is quite a cardio workout.
My teens have gotten into gym in the past year or two, though spend much of the rest of the time stationary, often horizontal. Apparently it's good for muscle development. They say.