"Shin splints" or medial tibial stress syndrome.
Wearing wornout shoes, along with all of the impact from triple jump and the poor flexibility, eventually leads to differences in movement. This leads to shin splints
Is this an actual question?
A I think it would be muscles and bones
The technique in having a flat stomach or not getting bloated is in choosing what you eat. You only have to eat food that are rich in fiber and drink water as much as your body need. You also have to limit food that are rich in sodium, most likely these are the salty food that you eat.
