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.
According to FindLaw, children under 7 should never be left alone. Children 8 to 10 years of age can be left home alone for up to an hour and a half, but only during daylight or early evening hours. Children ages 11 to 12 can be left home alone for up to 3 hours. Teens over 16 can be left home alone overnight.