How many letters does the top answer for “athletic facility equipped for sports or physical training” have?

The most common answer is gym (3 letters).

Crossword clue: athletic facility equipped for sports or physical training

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

gym 3 letters wn-def

athletic facility equipped for sports or physical training

gymnasium 9 letters wn-def

athletic facility equipped for sports or physical training