When you first bring a horse back into work, make sure that you have had them physically checked, their teeth attended to by an equine dentist, and their tack fitted. Start with groundwork such as lunging and longreining and reintroduce tack once they have settled in this work. When you first go to ride, do so in a safe, enclosed arena, and have your inside rein shorter, so you can control your horse by keeping a bend through their body.