Just got this super hyped sensor, using it in a karate session for 90 minutes, showing only 1 minute 19 sec of training? Resting time 88 minutes? It was as usual intensive training but this sensor recording mainly rest time? Data field "Fat Burner" showed only 7 gram of fat burned during this time (usually it shows about 50 grams). So, is there a setting or activity that is optimized for indoor HIIT traing using HRM Pro+? Or is the best option just to use my old HRM-Dual with watch during training?