The Play4Life scheme is helping to deliver the active side of the government's Change4Life campaign, which is promoting healthier lifestyles among children.
Parents can find their local participating play centre on the Play Providers website and can claim free play on visits until the end of this month.
Janice Dunphy, chair of the association, said: "Indoor play is a great way for children to let off steam and the beauty is that the British weather cannot spoil it. Because the children are having fun they don't even realise what they're doing is helping them stay healthy."
According to the Play Providers Association, which represents the interests of indoor play centre operators, an average two-hour visit to a play centre provides double the government's recommended daily activity for children.
