"For the past eight months, I have volunteered every Wednesday evening at our local animal shelter. I will help with grooming the animals, feeding them, and walking them. It's been an enjoyable experience and rewarding at the same time.
OR
I have not formally volunteered in these most recent years, however; I spend a lot of time helping my sister who is a single mom. I will babysit on weekends, cook dinners for her and drive the kids to appointments when necessary. I feel that it is essential to take care of the needs of the family."