Competitive swimming in 1930s: Butterfly evolves
governing-body medical screen and not a live meet brief. Memberships and qualifying times belong to national f Most of the world’s racing happens in short-course 25-metre halls, not in Olympic finals. The skill ceiling in At the beach gate, read the flag for Competitive swimming before the clarity in a photo. Year 1930s, line “Butterfly evolves,” figure 54. Tide and wave height are not a mood. Not a certifying agency, medical advice, or dive briefing.
Most of the world’s racing happens in short-course 25-metre halls, not in Olympic finals. The skill ceiling in this atlas is high because technique, training load and race craft stack for a decade. Risk stays low relative to wreck or night diving: the hazards are overuse and the rare shallow-water dive, not current.
This chapter is a club-sport map, not a governing-body medical screen and not a live meet brief. Memberships and qualifying times belong to national federations. Municipal and club pools publish lane books before open-water leaps. Red Cross / federation lessons gate beginners — a dive card is not a pool pass.
Indoor 25 m is year-round; outdoor seasons follow local climate. Competitive swimming mapped for mechanisms, locale notes and limits. Competitive swimming sits in the swim atlas — mechanisms, locale notes and limits, not slogans. Adoption and meaning follow coastal and inland water sites as much as peak specs.
The gate keeps flag, depth, and limit. If “Butterfly evolves” is the limit, the figure is 54 and the year is 1930s.1930s
Figures to keep
- Year of the limit
- 1930s
- Water figure
- 54
- Topic
- Competitive swimming
- Field line
- Butterfly evolves