Answer:
carrying weight which are heavier than you on your back
improper sleeping positions
Explanation:
accidents and injuries : they also cause delay in motor abilities.
Age: Older children have more strength, agility and balance than younger children. Motor skills will be improved with age.
biological factors like gender. Boys have more upper body strength than girls. They can throw faster and accurately than girls. Girls are more flexible in their hip joints and so they may be more agile than boys.
