take the weight belts, (not weight vests). it is close to your centre of gravity,the hip area so your body naturally takes in the weight, yeah but i heard some say that weight beltsprevent you from using your back muscles, so decide yourself.

2nd choice for me would be jumpsoles, cos that help to use the specific minute ligaments that are not trained regulary and strengthens them so your ankle wold be stronger and less prone to injury

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age: 13
height: 5"2 / 157cm (dream height 175cm)
weight: 80 pounds/ 35kg
standing vert: 24 inches (never trained before)
running vert: 25 inches (same thing above)

aim:
1.standing and running vert 30+ inches
2.get the vjb
3.become a centre in my school team cos the tallest centre we have is only 170cm ... dots