Does increasing same amount in tibia and femur affect your athletic ability?

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Can increasing, for example, 2.5 cm in Tibia and 2.5 cm in Femur, help not affect your athletic ability? I've read a lot of people complaining about how they find it hard to run and Squat because of how their femur or tibia are too long. There's also the complain of balance and agility, which, can increasing muscle mass in the legs help?

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I didn't mean it professionally. Just casual running in the treadmill or jogging from time to time or even play football on the beach (which is something I do often on summer)