Scott does a full walkthrough of Training for the Uphill Athlete book, chapter by chapter, AND IT'S FREE:
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With how much info they put out there for free, I feel like the price of their training plans is a steal.
Take their new 20 week Backcountry Hunting program for $65, with coupon code EXO through the end of April brings it down to $50. AND YOU OWN IT FOREVER. You can reuse year after year. Compare that to MTN Tough, which is $30 per month. 2 months of training is more expensive than something you can use forever. Comparing the first cycle of the program (5 months) it'd be $50 vs $150. Just from a price perspective (and ignoring the clear difference in results), it would be very hard to justify MTN Tough.