Okay -- since
@Ghosts Beer asked these questions, I will answer some of them. Prior to that, I'll give you my background in training elite athletes, and not just some BS about my job makes me non-biased.
Now, this isn't to toot my own horn, but I've played rugby league at high levels, even for the United States. I've played a total of 6 test matches against other countries, I've played high levels in England as well. Here's a site that has my international numbers as proof
Rich Henson - Career Stats & Summary - Rugby League Project. The team that I play for right now had an athletic trainer with a master's degree who, at the time, was a professor at Bryn Athyn College. Being in the USA Player Pool since 2015, I've been under the guidance of different athletic trainers, strength/conditioning coaches, doctors etc. Being around those types of people, I've picked up a lot of training and recovery methodologies. On top of that, my day job is as a scientist, so naturally, I have background in researching of scientific literature, which I've done on multiple occasions regarding the proper way to train or to recovery. I also own a few books which site scientific studies on training.
Now to answer questions.
Yes, practice counts as physical activity. Depending on a goalies workload (which includes all physical activity, games, and on/off ice training), he may or may not have to take a maintenance day or two. Prior to the season, most professional teams have baseline tests (various exercises). They will then test the athlete at various times of the season. The results of the in-season testing can show if they are fatigued or not. Grip strength is used quite frequently. One test you can use is to squeeze an analog bathroom scale each week and see how much deviation you get from your first number.
You are comparing apples and oranges when you compare skaters to goalies. Skaters shifts are 30 - 60 seconds of high energy output for 10 - 25 mins. They usually get 3 - 5 minutes of recovery between each shift as well. The movements of skating vs goalie are quite different as well. Goalies typically have fewer total movements, but their power outputs per movement are typically greater (IE reaction moves). There is a direct relationship between the amount of power movements and the length of recovery time required. Hakstol's usage might be one reason why the injury occurred.
This is actually the biggest reason as to why it is important to look at potential usage and previous workload. There is a concept in strength/conditioning called prehabilitation. It's also a term used in surgery where you strengthen the area of surgery prior to the actual surgery to reduce the recovery time. In strength and conditioning, prehabilitation is a specific way you train so you are at your optimum during the season and you don't overtrain too early. Typically, you train to 110-115% of what your expected workload will be. That's everything from your periodization (training schedule) to your specific trainings, to rest periods. Gone are the days of simply training as hard as you can all the time, that's been proven as an inefficient use means of preparation, as well a risk for fatigue later in the season. It's the same thing for long distance runners, you only run the marathon pace during the marathon. So if he was used to a specific usage and expected to play around the 45 game marks as he had the last 3 years, his training would have not been to become ready for 65 games, but rather about 50 games over the course of the season. Being forced to play more than that would potentially cause fatigue, leading to an injury.
It's logical for a college keeper, who is in his athletic prime, who knows what his workload is, to be prepared for that work. Also, it's not just the back to back, it's the 3 in 4, or the 4 in 7 that are the problem.
As I said before, this information doesn't prove Hakstol is at fault, but it does shed some light on the situation. Feel free take it or leave it. And if any strength/conditioning coach or athletic trainer or doctor sees this and there is something that is incorrect here, please update me because I want to know what is and what isn't correct.
And yes this took way longer than it was worth.