10 minutes of rowing is an excellent replacement for coffee for me, having quit coffee due to hypertension.

James Bond spent 5 minutes under a needle-sharp cold water shower before breakfast.

Pavel Durov (Telegram's CEO) does something similar but in a bathtub filled with 0 degrees water with ice added in it too.

Yeah, I do love me some coffee, but it's amazing what just a couple push-ups will do. All of a sudden you have blood flow in the upper part of your body and you just feel "ready to go".