Get into the habit or working out every day – or boost your current workout routine – with a printable 30 day workout challenge. Fitness challenges are always popular, but are they really a good way of getting fit? This is a question that comes up quite often. Obviously, 30 days is only a short term plan and there’s a limit to how much difference a few minutes a day can make to your fitness. But there are lots of benefits to doing fitness challenges.