Set the circle up properly
Lunging goes wrong most often before it starts. Choose an enclosed space with level, forgiving footing, because deep or slippery ground turns every circle into a strain, and check the whole track for holes, stones and forgotten poles. A lunge cavesson keeps pressure on the nose rather than the mouth, which suits young or green horses; a bridle works for established horses, with the line attached so it cannot twist the bit. Leave any side reins off until the horse is warmed up, and keep the spare line gathered in tidy coils in your hand: never looped around your wrist and never trailing at your feet, where a spook turns it into a trip line.
Your position is the aid
Stand so that you, the horse's head and its hindquarters form a triangle: the lunge line runs from your front hand to the horse, and the whip in your other hand points toward the hindquarters as an extension of your arm — a pointer, not a punishment. Your body does most of the talking. Step toward the shoulder to ask the horse out onto a bigger circle, toward the quarters to ask for more forward, and turn your shoulders and lower the whip to invite things to quieten down. Ask always with your voice first — walk on, trot on, whoa — before backing it up with line or whip, because a horse who works to your voice on the lunge carries those same commands into long-lining and early ridden work. If you find yourself pulling, the circle has usually shrunk: walk a small circle of your own to keep the track honest.
A session that builds instead of drilling
Start with several minutes of walk on a large circle in both directions so the horse loosens up and settles into the routine, then work in trot with transitions: walk to trot, trot to walk, and full halts where he stands straight and quiet. Keep the circle at a size the horse can balance on without leaning in or drifting out; twenty metres is a good working guide, and smaller circles are hard, joint-loading work that young horses should meet rarely. Cantering belongs to fit, established horses and comes out of a forward trot, never from being chased. Around twenty minutes of actual work suits most horses, and one who is blowing hard, rushing or switching off is telling you the session passed its useful end some minutes ago. Finish in walk on a loose line in both directions, so cooling down is part of the pattern.
Faults worth fixing early
A horse who turns in to face you is usually avoiding the work or confused by a whip held too high near his head; send him forward calmly and rebuild your triangle. One who falls in needs your position stepped toward his shoulder and the whip shown at the girth; one who pulls away and tanks off needs the circle enlarged and the transitions made more frequent, not a stronger arm. Any lameness, repeated tripping or a nodding head in trot ends the session: note which leg and which rein, and if it is still there at the next check, the horse needs the vet rather than more schooling. Lunging should leave a horse looser and calmer than it found him. With KinsLe Care Teams you can set lunging days as recurring duties alongside turnout and ridden work, each marked complete as it happens, so the horse's weekly workload stays visible and balanced.