Great points in the article!
Ballistics app for my computer and phone really helped my shooting. I am 6+ hour drive from my hunting areas, so pre-season scouting doesn't fit my work schedule. I do put on the boots and pack and train in the off-season. Neighbors think I'm crazy, but I really don't care.
Work / life challenges took me away from hunting for almost ten years. In the past few years I've concentrated my upgrade efforts in the following ways:
Optics: Leupold scopes and Leica rangefinder are still great, so no change there. Did upgrade to Zeiss 10x42 Conquest HD binos. Huge difference!
Shooting: Added bi-pod, dug in to ballistics more, experimented with different loads and got the rifle shooting much better.
Clothing: Upgrading some clothing options...badly needed.
Boots: I'm an 11.5 - 4E, so options are limited. Replaced the 20+ year old boots with new Irish Setter Elk Trackers this fall.
Pack: the next purchase...
Workouts: My gym has a pool...swimming really kicks my ass...but huge help with the cardio. I mix it up - hiking, running, weights, stairs, swim, yoga, MMA-style-training, etc.
Nutrition: wife had to go gluten free 3 years ago...I gave it a try and feel much better. Not for everyone.