Sorry, but you have gotta do those sprints. It might hurt but as they say, there's nothing easy worth doing. Once you get passed the early stages of fat loss, sprints become particularly important. You can ditch some pounds if you're carrying a fair bit extra but once you get to around the 10% body fat range, sprints are a must. Afterburn, or EPOC, can make sure your body burns fat for up to 3 days afterwards. That way, you're literally burning fat all the time, so long as you do your sprints 2 or 3 times a week. It only take 15-20 minutes of your time. Do it.