That is an effort to promote harmony, balance and peace in body, mind and in spirit. This is so important because our spirits cannot find peace if our bodies are neglected nor if our minds and emotions are in turmoil. Nor does it work to fall into a very common spiritual self deception. That is the assertion I often hear from those who are unwilling to do what it takes to take care of themselves emotionally and physically, that prayer should be sufficient. That truth is that it is not.
Prayer is central in our lives and of utmost necessity.
However God expects us to be responsible and to be good stewards of all of his creation including our minds and bodies. Hence we have to be willing to do what it takes to take care of them. That means that we have to work at it. Being on our knees in prayer is only a part of that work. There is much more.