I've also played around with posture adjustments, but I've found that focusing on my foot strike has made a bigger difference for me. Trying to land midfoot instead of heel striking has helped me reduce my energy expenditure. It takes some getting used to, but it's been worth it. Give it a shot and see if it works for you.
As an advanced runner, I can attest that strength training has helped me maintain good form and reduce my risk of injury. It's not about getting faster, but about being able to handle the demands of running. I do a mix of lower body and core exercises, and I feel more resilient on my runs.
Great article! Jess Hull's determination and work ethic are truly inspiring. Her focus on the 1500m is admirable, and I'll be cheering her on in Paris. She's got this!
Good point about mixing it up! I'd also suggest paying attention to your overall weekly mileage and intensity. If you're doing the same intervals every week, your body may not be challenged enough to see progress. Consider adding a weekly hill repeat or tempo run to shake things up.