Blonde Girl On The Towel Strips Her Bikini And Sunbathing At The Swimming Pool

USA Swimming (USA-S) swims in both metric and non-metric pools. However, the international standard is metres, and world records are only recognized when swum in 50 m pools (or 25 m for short course). In general, the shorter the pool, the faster the time for the same distance, since the swimmer gains speed from pushing off the wall after each turn at the end of the pool.
• Width
Most European pools are between 10 m and 50 m wide.