SPR is the ratio of effective stack to pot size after the flop. A low SPR (≤4) means the pot is committed — strong top pair plays for stacks. A high SPR demands more caution with one-pair hands. Gordon teaches you to plan the hand before the flop based on how deep you are.
"Before the flop, think about the SPR you'll create. That ratio tells you how much hand strength you need to play for stacks."