Speed is the quickness of movement in sports and can be expressed as maximum speed, power, or speed endurance. Speed is influenced by factors like muscle structure, strength, technique, and energy systems. There are different types of speed like reaction speed, speed of movement, acceleration speed, sprinting speed, and speed endurance. Speed training involves drills, sprints of various distances, uphill and downhill running, and overcoming the speed barrier through indirect training when direct speed work plateaus. A sample speed training week alternates weight training, short speed workouts, and long speed workouts.