Running

running at 10k ft (3000m) altitude the past 3 days was really interesting

did a 5 mile (8km), +410ft elevation (125m) run at what felt like slightly faster than threshold pace, and it ended up being 6:51/mi (4:16/km)

first run back at ground level: 21.1km in 1:48 (8:14/mi = 5:07/km) @ 128 BPM heart rate

Training at high altitude can have a significant impact on your performance when you return to lower elevations. Your body adapts to the reduced oxygen levels, making running at sea level feel easier and more efficient. Keep up the good work and enjoy the benefits of your altitude training!