The second question: Being a soldier is very hard, which requires not only perseverance and confidence. And have such ambitions. Everything should be standardized and meticulous.
The third question: The best way to improve physical fitness is exercise. You can go running in the gym, dumbbell. You can also ride every bike often. Or buy some lead bags and tie them on your legs and arms.
Internal horoscope: When walking, keep your knees and toes straight ahead and don't deviate. Practice jumping down the steps. When jumping, your toes are close together. After the jump, whether it is the "outer splayed foot" or "inner splayed foot", the toes will move forward. After practicing for a while, walking will be normal. Shuttlecock kicking is not only a sport, but also can be used to correct splayed feet.
Slight strabismus: mydriatic optometry can correct hyperopia.