ratsastus

Noun

 * 1) horseriding, equestrianism, equitation act or action of sitting on and controlling a horse for sport, recreation or transport
 * 2) riding act or action of sitting on and controlling any animal for sport, recreation or transport
 * 3) horse racing horseback riding as competitive sport
 * 4)  combination shot shot in which the white hits first other than the actual target ball

Usage notes
Unlike in English, one does not "ride" a bicycle or motorcycle in Finnish. The verb used is (to drive), and the term for the act of driving is  or the fourth infinitive form of the verb,.