I've been going to a local affiliate gym twice a week for the past two weeks and am already seeing pretty good results. They had a 75-minute introductory class

I've been going to a local affiliate gym twice a week for the past two weeks and am already seeing pretty good results. They had a 75-minute introductory class that taught all of the movements, and they review form and answer any questions before each workout. It's basically a super intense 15-30 minute workout, preceded by a standard 10-15 minute warmup. For example yesterday was 12 "sumo style" deadlifts, 6 burpees (squat thrusts), 12 pullups, and 6 more burpees, repeated as many times as possible in 15 minutes. My only complaint is that it's a bit pricey given the level of facilities, but since all of the sessions are small groups with a coach, it's not unreasonable. Of course if you have a reasonable level of self-discipline (I don't) and room and money for the equipment (I don't) there's no reason you can't do the workouts at home by yourself or with a group of friends.