I turn the water on as cold as it gets for 2 minutes, and then go 1 minute warm.
Ah yes. I used to do something similar back in the day. I would do my normal shower heh, then before I got out I would turn the water on cold and have it on the legs only. Occasionally I would go back to warm then back to cold. The Finns do this with their sauna –> jump in the cold water –> sauna.