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Most youth soccer players want to increase their quickness on the soccer field. Note that some subjects completed their acceleration within 20 steps (i.e., 10 strides for the right leg that was equipped with EMG electrodes and motion analysis markers), and all subjects had reached a velocity higher than 95% of maximal velocity at the 20th step).
These are athletes who can full-squat double their body weight or better—i.e., not your normal high-school or even college athlete. Research on the fastest sprinters in the world show they have the capacity to produce extremely high ground reaction forces per kg of body weight (Morin.
This will allow full recovery between sets and can improve your sprinting ability over various speeds. Youth athletes should generally focus on certain positions involved in changing direction such as being able to maintain a low hip position and a forward lean in anticipated and unanticipated change of direction tasks.
The ration between total change in velocity and time is called average acceleration. Unfortunately, most college programs suffer from being overly simplistic due to the need to try to train 40 or 50 athletes at once in a facility. Another thing to consider when accelerating is the point of foot-to-ground contact in relation to the athletes centre of mass.
Example speed drills rugby program for field or team sport athletes during an in-season phase, playing one game per week on Saturday. Developing powerful concentric leg strength is crucial, as is using weighted sleds with a relatively light load (5kg). Most American Football players today will already place a large emphasis on strength training as this has been emphasized for a comparatively longer time in the sport due to the ever increasing demand for larger and stronger athletes.
This means speed can be taught and all athletes have the potential to increase their speed. Some athletes go with the leg they feel is stronger or even do some tests with their coach to determine which one is more dominant. Horizontal GRF relative to bodyweight is likely a key to improved speed during the initial strides of a sprint.