Most people think of warmups as something physical, but a short mental warmup can be useful too. Before a study session, a gaming session, or a block of focused work, a few quick challenges can help you notice how sharp or distracted you feel. The important thing is to keep the routine short. If the warmup becomes a project, it stops being useful. A practical routine can include one reaction challenge, one memory challenge, and one attention-based task. That gives you a quick sense of speed, recall, and focus without taking over your day. For this kind of routine, a browser collection of online brain tests works well because the tests are easy to start and easy to repeat. You can choose reaction time, number memory, sequence memory, visual memory, click speed, or aim training depending on what you want to check. A simple five-minute flow might look like this: Start with one reaction time run to check alertness. Try a number memory or sequence memory challenge.…