The physical foundation behind performance. The posterior chain, GPP and carries, why strength training makes endurance athletes better, and what body composition actually means in the context of a six-event test.
General physical preparation is not conditioning. It's the work that builds the general foundation on which specific adaptation sits — carries, sled work, connective tissue robustness — and why Event 6 is essentially a GPP test.
Most endurance athlete strength training is abysmally bad. Real strength training — the deadlift, the squat — produces direct carryover to running economy, injury prevention, and late-race performance that no amount of high-rep circuits can replicate.
The posterior chain is the limiting factor in more lifts, more strides, and more carry events than most athletes realize. What it is, why it's almost universally underdeveloped, and the exact exercises in the program that address each function it performs.