Thumpa-thumpa, thumpa-thumpa, bump, thumpa, skip, thumpa-thump, pause … My heart wasn’t supposed to be beating like this. Way too fast, with bumps, pauses, and skips. On my smart watch, my pulse was topping out at 210 beats per minute and jumping every which way as my chest tightened. Was I having a heart attack? The day was July 4, 2022, and I was on a 12-mile bike ride on Martha’s Vineyard. I had just pedaled past Inkwell Beach, where swimmers sunbathed under colorful umbrellas, and into a hot, damp headwind…
