In cycling, for example, your
Source of the Truth should be performance metabolic testing (image below). This is where you are in a lab. The practitioner is a master's, or PhD level physiologist. You on on a bike erg. You are breathing into a mask, and your exhaust gasses are measured. The load is increased, incrementally, and every 2 - 5 minutes (depending on practitioner), you get pricked and a drop of blood is taken to measure lactate levels (lactate is a proxy for a negatively charged hydrogen ion - what causes muscle burn). Cost is $200 - $400. At the low end, the cost of a high performance pair of tires. An FPT test in your basement just provides a glimpse.
In skiing, it is also a MS or PhD level physiologist, exercise science person, or PT. they will lead you through dry land dills. These drills will help them understand if your body can influence your skis in the three ways that we are able to. There will be specific tests for strength. Most people have all the strength that they need to execute. The best practioner that I have found is a PhD PT in Seattle. She is also a PSIA L3. She can work remotely. A trip out to ski with her for a day, and then do a day in her clinic, would be like 10 years on your own. Go hit Baker while you are out there.
What is lacking for most is technique. That is accomplished with an instructor or coach. If you are not working with said mentor, if you are not in the snow 4 - 6 times per week, executing drills for an hour or two, if your time is spent in the gym, in the words of strength training coach Louie Simmons,
"When you attempt to build capacity on dysfunction, you are actually deepening the attractor state of your compensation. Thus, you are building compensation, not capacity.” For example, you may think that you need HIT training for cycling. However without data that is specific to you, you are in a place where you don't know what you don't know.
For my money, spending a few hundred to enlist a true professional is money well spent. I find that when one has accurate, granular information, you have a clear path.
IME, as an instructor, the boat that everyone misses is range of motion training that is specific to their bodies, and their specific skiing movement patterns.
Enjoy.
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