Shock horror alert!
Any form of impact - running, boxing etc - is good for bone health!!!
Why? Cos in causing micro damage to the bone's structure you stimulate growth and repair - thus increasing your bone mineral density = thicker and heavier
bones.
So walking/running can help stave off osteo in your legs, hips and spine. Boxercise will do the same for your upper body and arms!
But you do have to balance your workouts, as overuse will cause injuries that a) prevent you form exercising and b) can increase your risk of osteo!
So moderation is key!
Oh! I so have my teacher's head back on.... is summer nearly over?