Equipping keepers the best way. During training or match, goalkeepers should be outfitted for best protection: long pants, long sleeves, and shin guards. I prefer that keepers regularly use shin guards at training and during a match not just to safeguard them from injury but also because they have to wear them in games and should be used to them. They may further possibly use other shielding equipment, like hinge pads, elbow-guards, jocks, and body armor.