Yumi Kida, an Olympic marathon swimmer from Japan, is shown well-prepared with 3 gel packs stuck in her swimsuit before the 15 km FINA Open Water Swimming Grand Prix race on Isla Cozumel.
The 27-year-old Kida takes a combination of hydration drinks passed to her from her coach as well as the gel packs that she takes at her convenience during her 10 km and 15 km races.
The practice is what nearly all the professional marathon swimmers do.
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