I did a 25 minute run at 170bmp and the watch said new LTH detected 172 and asked me if I wanted to use this as my zones I agreed. Now my zones changed before it was warmup, recovery, easy, threshold and maximum and now it's warmup, low aeorbic, high aerobic and an orange/red zone I didn't hit today. The grey zone which was recovery is now low aerobic and is higher. Is it another gimmick and if not does the 935 do it?