לִווייָתָן

After the warm-up, pace was Easy (5:22/km), where HR should be 128–138 bpm. HR averaged 144 bpm — Steady; 61% of the time it was above the pace zone, mostly Steady and LT1. It was above the zone from the start — typical of residual fatigue, heat, stress or illness. If the effort felt normal, check the HR sensor.