Lot's of good advice above. But I think there is no better practice than the ancient sport of 'roving' aka 'stumpshooting', in forest and field. Nowadays, judo points work best, and it is better with more than one archer. Someone picks a target, a leaf, a pinecone, a weed, maybe under a limb or between two of them. Maybe kneeling. All shoot one arrow and the one that is closest picks the next target. It also works as a solitaire sport.