Bill Evans has a PhD in Exercise Physiology, coaching experience at the D1 level, and is the founder of Endurance Laboratory. He has more than 20 scientific papers published in his field and was formerly a senior scientist at Johns Hopkins University in their Applied Physics Laboratory.

Today, he's helping you improve your running economy. We discuss:

• The impact of easy running and different types of workouts on economy
• How to order workouts during a season
• How drills, plyometrics, and strength training improve efficiency
• Long-term and short-term perspectives on economy

To improve your form, don't miss our Form Cues Cheat sheet (my favorite 3 form cues, how to use them, and when).

Boulderthon is a top 10 race in America according to USA Today and one of the best fall marathons according to Runner's World. With a 5k, 10k, half marathon, and marathon, Boulderthon offers an amazing fall destination race weekend right at the foothills of the Rockies. Use code STRENGTH20 for $20 off the marathon or half marathon.

Join me in Boulder, one of the top running destinations in the country, on September 27th, to experience the tight knit running community here, race on the epic streets of Boulder, and finish on historic Pearl Street. While I live in Denver, I travel to boulder probably once a week to run. It's arguably one of the best running locations in the United States.

There'll probably be cool and crisp fall weather for racing fast, too. And don't worry, Boulderthon is a BQ-eligible, USA Track & Field Sanctioned Event.

Boulderthon is on track to sell out again this year so don't miss out. Use code STRENGTH20 to save $20 on the marathon or half-marathon here and I hope to see you in Boulder this fall.

We're supported by our newest partner - Wahoo Fitness and the best treadmill in the game, the Wahoo KICKR Run. I have been fortunate to run on a KICKR Run treadmill and they're unique - you will immediately know that you're experiencing one of the smoothest, sturdiest treadmills you can buy.

Go to Wahoo Fitness and use code STRENGTHRUNNING to get a free KICKR Headwind Bluetooth Fan ($319.99 value) with your purchase of a Wahoo KICKR Run treadmill.

They like to say that it's the treadmill that follows you, not the other way around. And that's because it's dynamic - there's a lateral tilt feature that mimics real-world terrain. So as you're running, it varies the side-to-side angle by half a degree every few seconds to keep your muscles ready for outdoor running.

And the KICKR Run's dynamic pacing is straight out of a sci-fi movie: the treadmill will match your pace automatically: no controls needed. You'll get a more natural running experience with no breaking to reach controls or setting the pace manually.

See what all the pros are raving about with the Wahoo KICKR Run Treadmill. They changed the game for bike trainers in the cycling industry - and now they're doing the same for runners. Don't forget to use code STRENGTHRUNNING to get a free KICKR Headwind Bluetooth Fan!