What should I do if my feet hurt when I walk between swimming lengths?

Your condition is plantar fasciitis. The foot's exercise system will ache if it is overloaded. It has something to do with the long standing time.

Suggestion:

One: soak in hot water twice a day for 20 minutes at a temperature of 50 degrees.

Two: plantar pad and arch pad ensure the support of plantar fascia.

Three: avoid standing for a long time or carrying loads, and avoid fatigue.

Four: Sanqi tablets can be taken orally to promote blood circulation.

Five: Try not to wear shoes with heels.

This usually gets better. Persistence is the key to deal with this problem.