In 2017 my husband and I went on a gorilla trecking trip, climbing up the side of a volcano in Rwanda. He was diagnosed with HCM at 42 and 30 years later he was still fit etc, we end up at 8000 ft.with no shortness of breath or fatigue sooo go figure. Fast forward to March of 2018 and he had a complete heart block and ended up with an ICD, Strange how things suddenly change because on October 4 2028 had septal myectomy. So take care and keep an eye on any small change.