Yes, it's effective - at least for some of us. You may find the common 20 or 25 minute sprint lengths too short to get into flow. But on a day when you're havi

Yes, it's effective - at least for some of us. You may find the common 20 or 25 minute sprint lengths too short to get into flow. But on a day when you're having trouble getting started at all, they're a good way to get your butt in gear. If you're focused, nothing forces you to stop at the end of the sprint. When I'm ready to buckle down on a big chunk of work, I'll more often set myself a 50-min sprint, though. And if you do work through the "break" period and into another sprint, just make sure you take a nice long brain break once you hit a stopping point. Part of the purpose of those breaks is to keep you refreshed so you can continue to concentrate.