Intermittent fasting - actually I'm pretty skinny already and losing muscle through less exercise so I actually want to gain a couple kilos! Hahaha!
I used to do cold showers from the start but I find the soap doesn't get on and off as easily so now I end my shower with a quick dash of cold... it's an easier transition as there's a few seconds of it mixing with the warm water still on your body! Hahaha! It's hot enough in Cape Town that we need to take quick cold showers to cool down in the middle of the day and before bed too!