Tarzana has plenty of places to work out, from the big gyms along Ventura to the small studios tucked into the strip centers, and some of them are very good at one thing. What is harder to find is a single coached hour that covers all three: cardio on your own machine, strength at your own station, and functional work, in a room capped at 24 so the coach can see every person in it. Nothing to plan, no waiting on a rack, no wandering the floor. You show up, and the hour is already built.
The other reason is that the drive is short enough to become a habit instead of an event. Ten minutes west on the boulevard, sixty minutes of class, ten minutes back, and the whole thing fits before work, over lunch, or after the evening crawl on Ventura has thinned out. If your day already runs along the Tarzana stretch between Lindley and Corbin, the studio is one more stop on it, not a separate trip.
Weighing it against the gyms closer to you? The guide to gyms in Woodland Hills lays out the honest trade-offs, including when a big-box gym is the better call.