My mom was a professional fitness competitor so I go into the gym with her. I train with my dad and mother. It's embarrassing because she's really strong.
At least for soccer players it comes down to a blend of two types of fitness – your base endurance which comes from longer distance running and your speed which comes from sprint-based workouts.
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You need to put what you learn into practice and do it over and over again until it's a habit. I always say 'Seeing is not believing. Doing is believing.' There is a lot to learn about fitness nutrition and emotions but once you do you can master them instead of them mastering you.