It is perhaps not recommended that you gift your selfie-videoing wife a Peloton for Christmas, if she seems to be scared of such a gift. (Yes, this is a reference to the maligned recent bike ad that drove down Peloton shares.) But if you can afford pricey boutique fitness classes such as Orangetheory and Soul Cycle, it actually could be a good idea to invest inhigh-tech home gym equipment for your exercise-enthused family this holiday season.  I crunched some numbers. If you go to a boutique gym three times a week (because everyone thinks they will go that much when pricing out subscriptions) for three years, it would cost you as much – or more – than a smart home gym. Consider: Soul Cycle, the popular indoor cycling class, would set you back around $10,500 over three years. Barry’s Bootcamp, approximately $11,250. At treadmill fitness studio Mile High run club, that would be more than $6,500. For Orangetheory, that’s roughly $5,600, and yoga studio Y7 could be close to $5,400, depending on which location you frequent. And if you consider that home gyms don’t require parking, transportation, locker room changes and malodor (other than your own), the scary price...