A day in the life of a Jockey at Saratoga race course...

From CNN…

Heaving bowls…
"It may sound shocking to those outside the racing industry. But the basins installed at U.S. race tracks for vomiting, or "flipping" as it is known in the trade, is one of the more extreme dieting methods used by professional jockeys.
The use of heaving bowls still remains largely taboo, with 2004 HBO documentary "Jockey" causing a stir after it showed footage of the bowls at Churchill Downs race track -- home of the prestigious Kentucky Derby.
Retired jockey Jeff Johnston says they are still a regular, if unspoken, sight at many U.S. race tracks"

Yes staying at the right weight is one of the toughest parts of being a jockey. I've interviewed jocks who eat the diet of a rabbit to stay within weight. On top of that challenge they have to be in top snap to be able to have enough strength to guide a 2000 lb horse around a race track.