Strava stalking
When athletes check every single workout of their friends and fellow competitors via the Strava fitness website or app. They know what type of work out the did, the route, the total moving time, elevation gain, heart rate, and all the other Strava users with them. They frequently analyze this data against their own, and gossip with others athletes about said workouts seen on Strava.
Joel and Tyson spent half a day Strava stalking Rachael and Stacy during their training run in Hawaii, so they could pick apart their pacing on the hills.