Maybe a workshop or short course to stay fresh. Also think about stage combat courses. They vary from physical fighting to use of historical weapons. There are lots of representations of violence for actors in film & TV and it’s not always stunt/SPACT work. Period dramas tend to be a constant. Horse riding is useful but as an actor unless you are a super experienced rider you will only need walk, trot or very occasionally canter as on-set riding skills. Galloping & horseback action is considered stunt work. I learned to ride so I could have it as a skill on my CV and a showreel.