This is true. Over time a vitamin C deficiency can cause the tissues in the body to break down.
Definitely D, it will cause you to lean back resulting in a fall
Although exercise is the best way to do that, there are other ways.
Practice controlled breathing exercises, which are easy to do from the comfort of your home.
One is where you take a few small breaths in and one large breath out. Keep doing this.
Breathing exercises are also relatively easy to find on the internet.
