Question

how can families best achieve a positive effect on physical health?
by taking walks together
by going shopping together
by attending church together
by watching movies together

Explanation:

Taking walks together is a form of physical activity. Physical activity has a direct positive impact on physical health as it helps in maintaining cardiovascular health, muscle strength, and overall fitness. Shopping together may involve some walking but is more about purchasing items. Attending church together is more of a religious or social - gathering activity. Watching movies together is a sedentary activity which does not contribute positively to physical health in terms of exercise.

Answer:

by taking walks together