Hell f***ing yeah! Just had a miracle happen. I had been stuck at 383 for the 800 dash challenge in HLD for four days but on my first run past 400 I made it to 806. And I was on the verge of giving up. I used a metronome app on my phone and it worked like a charm. On my successful run I was able to perfectly synchronize with it. At about 750 it felt like my heart was beating out of my chest.