I immediately swapped my long runs and sprint intervals for recovery jogs. I ran to find my tolerance and comfortable edge, as instructed by physios, then repeated that over and over again. I lifted and lowered light dumbbells and pulsed repetitively with a resistance band in the name of rehab. I swallowed white powders (legal ones, purchased from Holland & Barrett with words like joint health written in bold and circled on the containers). I avoided the bike and the stairmaster despite my dry skin longing for sweat, knowing they also made my knee ping.