[header] How to condition your horse for endurance riding [title] Assess how fit your horse actually is. [step] Does he start puffing when you take him up a short slope? [title] Once you have assessed your horse, slot him in at the relevant level. [title] Starting with the very unfit horse lunge them for 5-10 minutes each side every other day for a week, then increase to 10-15 minutes each side for another week. 
Be careful you aren't stressing your horse as lunging can be stressful for your horse's joints. [title] After two weeks start riding your horse-start slowly.