This is, of course, not true. Nothing is every universally applicable.
Go to the gym and do a heavy squat or deadlift day and I assure you that you'll feel pretty tired for a bit after the session. This is basic science. You can mitigate this by nutrition post workout, but even so, there will be a lag in time when you could feel drained.
Go to the gym and do a heavy squat or deadlift day and I assure you that you'll feel pretty tired for a bit after the session. This is basic science. You can mitigate this by nutrition post workout, but even so, there will be a lag in time when you could feel drained.