Gymnastic and sporting articles, including skateboards; skateboard decks, wheels, grip tape; skateboard decks having reinforcing elements to prevent wear, skateboard axles and axle parts and fittings, skateboard repair kits, protective sporting articles including, elbow pads, knee pads, wrist guards, gloves; reinforcing rods and elements for reinforcing wear edges on skateboards; maintenance kits for reinforcing wear surfaces and edges of skateboards