Linial Excercise physiology(Osteoporosis)

review 4 research papers that examine the role of exercise in either treating OR preventing this condition(Osteoporosis).

Also,should be:
Outline condition.
Presenting evidence from 4 papers.
Critically analyze.
Looking at the difference.

Assessmen Criteria:
Demonstrate succient critical wriring,depth and width of understanding,some original interpretation.
Harvard Style