Nick Pappas, MD on Instagram: "Bone density peaks at around age 30. If you don’t put stress across your bones in the form of activities like resistance training, the bones will get weaker with time. In addition, muscle mass will also decline. 💪 Resistance training is the key to preserving both of these. 👩🏻 20% of women over each 50 will develop osteoporosis (thin bone). Once you lose bone density, it’s very difficult to regain it. The weaker your bones are, the more likely they are to fractur