Osteoporosis is holy bones. Osteo = bone, porosis = contains pores. All human bones contain holes, so osteoporosis is a relative term usually meaning more and bigger holes or pores than is desirable. Actually, osteoporosis is the decalcification of bones to the point of them becoming weaker and easier to be broken. The condition is found most prevalently in astronauts, senior citizens, and those who are bedridden. That is because bones have the ability of becoming stronger under stress and weaker when there is no stress. Gravity is the natural opposition (the good kind of stress) that makes live things strong.
Under healthy conditions, most forms of exercise will strengthen the bones, but when osteoporosis is known to exist, it is best to exercise without instantaneous trauma and impact on the weight bearing joints.
Exercise can be helpful in building and maintaining strong bones. Exercise that forces you to work against gravity – so called weight bearing exercises such as walking or jogging [and rebounding] are beneficial.
The minitrampoline provides a convenient form of exercise with a major advantage being its apparent low level of trauma to the musculoskeletal system. Only takes 3 mins 1 to 3 times a day.