I sleep for 7 hours and have 45 mins of deep sleep, or 8-9%. Internet tells that it could be 25% and it bothers me a little. Though I feel ok

I heard the best thing is high intensity training. 1 min you run as fast as possible, 2 mins rest. Just 3-7 rounds of these count as a complete training. Not only you train your body to cope with 170bpm, but also you train it to loose bpms to normal level. These 2 points are essential