Massively Tight Hip Flexors When I Started On the Trainer

Agreed. I wrote above that I think my glutes are out of balance with the hip flexors (generally). IMO What illuminated the problem was the: 1. Starting trainer riding (previously 100% outside) so a muscular endurance shift so-to-speak or strain on the muscles. 2. The fact that I am spending more time in threshold, VO2max and anaerobic zones than before. 3. I slacked on core since the summer… 4. I’m old. :grinning: