mTORC1 activity A sits at baseline 1.0 and jumps after each session, then relaxes exponentially (the 24-48 h elevation window):
A += 4.0 x load x min(1, aa) at each session
dA/dt = -(A - 1) / tau
MPS = 0.9 A , MPB = 1
net = MPS - MPB
growth = 1 - exp( - integral(max(net,0) dt) / 40 )
Leucine and protein availability gate how large the spike is; closely spaced sessions stack before the activity has decayed, while long gaps let it fall back to baseline.