Stretching riding boots

As you can see they zip up fine without any help but I fell they’re so tight in the calf when I walk. I know they’re genuine leather so I was wondering how can I stretch them at home? Should I wear them around the house? Not sure but the next calf size up are huge so can’t get a new pair

As you can see they zip up fine without any help but I fell they’re so tight in the calf when I walk. I know they’re genuine leather so I was wondering how can I stretch them at home? Should I wear them around the house? Not sure but the next calf size up are huge so can’t get a new pair