Once you are comfortable with the height you can increase the difficulty, and improve your jump, by increasing the height of the box. (fitbodyhq.com)
A lucrative — if extremely risky — global industry has cropped up to perform a bone - breaking procedure that stimulates growth and can increase height by up to five inches. (discovermagazine.com)
They found that spending 3 or more hours playing outdoors during weekends was related to increased height at 5 years of age. (sciencedaily.com)