Sandra is 65 years old and expressed that she wants to incorporate more bone strengthening activities. What would you recommend?

A) Walking 5 - 10 minutes 3 days per week
B) Riding a stationary bike 30 minutes 5 days per week
C) Riding a bike outside 30 minutes 2 - 3 days per week
D) Weight lifting exercises 2 - 3 days per week
E) Swimming 60 minutes 3 days per week

Weight lifting exercises are the best option for bone strengthening. As we age, our bones tend to become weaker and more fragile, and weight lifting can help to increase bone density and prevent fractures. Walking and swimming are both good exercises for overall health, but they do not provide as much bone-strengthening benefits as weight lifting. Riding a bike, whether inside or outside, is a great cardiovascular exercise but does not have significant bone-strengthening benefits.