Keeping your child interested certainly isn't through rigorous "practice" or pressure. Make sure he's having fun instead of feeling nagged or pressured. If he shows no interest at the moment, try again another day, or try another activity. Pressure and anxiety can make him see these activities in a negative light. Instead, include them as a fun part of your day. Practice with everyday tasks so that they tie seamlessly into your day, like having him snap buttons on a shirt or pull small weeds from a garden.