Arena mirrors give you a useful second view of a schooling session. They can help you notice an uneven shoulder, drifting line or change in your horse's alignment, then compare what you see with what you feel in the saddle. A short, purposeful check is usually more useful than watching your reflection for a whole circuit.Start with one questionChoose a single thing to observe before you ride towards the mirror. Are your shoulders level? Are your hands at a similar height? Is your horse staying on the line you chose? Trying to assess everything at once makes it harder to keep riding clearly.Ask your coach to help you interpret the view. A mirror shows one angle at one moment, so combine it with coaching, your own feel and occasional video rather than judging your position from a single reflection.Introduce the reflection calmlyFollow the yard's rules and wear suitable riding head protection. Let your horse become familiar with the mirrors gradually, with extra space for a young or worried horse. Keep a safe distance from the glass and do not allow your horse to touch it. If your horse becomes unsettled, move away and get help from your instructor.The British Horse Society's equestrian mirror guidance covers safe use and installation. For a yard planning new mirrors, use a professional equestrian installation service and discuss siting and protection with the installer.Check your position at haltIn a safe place agreed with your instructor, use a settled halt to check whether you are sitting centrally, with level shoulders and relaxed, even hands. Your coach can help you see whether the position feels different from how it looks. The aim is a balanced seat that allows you to use the aids clearly.A front view is useful for symmetry, while a side view gives a different picture of your alignment. Do not twist around in the saddle to find an angle. Let your instructor describe what they see when the mirror is outside your normal line of vision.Use a straight line to compare feel and viewChoose an uncluttered route and ride towards a suitable mirror in a pace you and your horse are confident in. Take a brief look while keeping track of your route and other riders, then return your attention ahead. Ask your coach whether the horse's shoulders and quarters are following the same line.A drift may have several causes, including rider balance, uneven aids or the horse's natural one-sidedness. Work on the cause with your coach. British Dressage explains the relationship between alignment, balance and straightness in its scales of training.Observe a simple transitionPick a clear marker for a walkhalt or walktrot transition, as appropriate for your partnership. Let your instructor watch whether your body stays balanced and your hands remain quiet. Use a brief mirror check only when it fits naturally into the route. Look for one small improvement to practise on the next attempt.Work on both reins and allow breaks. Finish an exercise when you have achieved a useful improvement, rather than repeating it until the horse or rider becomes tired. For more session ideas, try our five flatwork exercises for a 20 40 m arena.Check your everyday schooling kitBefore riding, check that your tack is clean, secure and correctly fitted, and that the saddle pad lies smoothly. If you are choosing a replacement, browse our saddle pads and numnahs, including the Bucas Max Dressage Saddle Pad and Bucas AeroMax Dressage Saddle Pad. Choose the shape and size to suit your saddle and follow fitting advice from your saddler.Arena photograph by Jonathan Hutchins, via Wikimedia Commons, used under CC BY-SA 2.0. The photograph shows Reaseheath Equestrian Centre.