Sports

related to fitness

https://www.reddit.com/r/running/wiki/faq

https://www.reddit.com/r/AdvancedRunning/wiki/index

https://www.reddit.com/r/Velo/wiki/index

https://old.reddit.com/r/climbharder/wiki/index

Companies

Athletes are very serious about improving performance and that usually requires measuring it.

• catapultsports.com
• statsports.com