I had a phase experimenting with this.  I did in combo with Wim Hof breathwork. It is 💯 a thing that is refreshing and awakening, worthy of the commitment… like a good workout, you’ll never regret it after. The challenge I had was the maintenance. Takes work to clean out the tub, keep pumping ice in, and even getting it cold enough to sustain over time.  I’m planning on breaking out my old trough for the winter season, but my longer term goal is to have a lake I can jump in during the winter months, or if I can bring myself to the capital commitment, buy a legit ice tub.