The most effective way to exercise for fat loss is to create a program that combines high-intensity and low-intensity exercise. Thatâs because each type of exercise promotes fat loss in different and complementary ways.
Since you asked, I do think it is odd that your grandchildren sleep with you if you have other accommodation available for them. Also, a nine-year-old should be able to bathe or shower alone. I would worry more about lack of independence at that age than anything improper, but at age 9 I would expect a boy to be more modest than you are describing.
Most authorities agree that leaving a 12 year old alone at home for an hour or two is acceptable, but they should not be responsible for other children.   Legal Age (Updated)   There are very few states in the U.S. with legal minimum ages for children home alone, but many state agencies have published guidelines.