The phrase "in saddle" typically refers to being on a horse or bike, but there are a few synonyms that can be used interchangeably depending on the context. For example, "on horseback" is a common substitute for "in saddle" when discussing equestrian activities. "Cycling" or "biking" can replace "in saddle" when referring to traveling by bicycle. Additionally, "mounted" or "riding" can be used if a more generic term is needed. These synonyms can add variety to a piece of writing and make it more engaging for the reader, as well as offer alternative ways to describe someone on horse or bicycle.