Ice baths are not necessarily suitable for everyone. Look at Bryan Johnson, who has tried everything he can, yet hasn't touched ice baths. They are not a health必选项 but a high-intensity tool. But I have a strong personal feeling: ice baths can be very effective in lowering heart rate. Especially after the pandemic, many people are not actually having heart problems, but their autonomic nervous system is out of whack—walking with a heart rate of 80+ and a long-term RHR above 65 during sleep. If you are also in this situation, my suggestion is to give it a try.