You will burn your team out if you expect them to hold a breakneck pace all the time. Demanding consistent, consecutive sprints can only get your group so far. Before you know it, you’ll have a death march on your hands. I know some of the hardest working people alive and even they can’t keep it up forever.
As a manager, you need to pick one or the other: train for sprints or train for a marathon. If you want your team to run faster, make room for breathers in between runs. Expect regular half days or days off. Plan retreats. Schedule time for your people to recover. If you want your team to consistently deliver, you must manage a pace that can sustain itself. Steady days. Reasonable expectations. A full night’s sleep.
Neither is right or wrong. Some groups perform better as sprinters, others as marathon runners. It’s important to study your situation, listen to your team and coach accordingly.