I've got about 3 stone of weight to lose to get to where I would like to be (at the mid level of a health BMI so about 9stone). I've been reducing my portion sizes and stopped snacking and, combined with couch to 5k 3x a week at the gym on the treadmill this has been producing quite good steady results. I'm now at the point where I'd like to add some weight/strength training 2 or 3 times a week at the gym but I don't know where to start. I can't afford a personal trainer and of course there's loads of stuff on youtube but I don't know what videos are good for beginners. Anyone have any advice on where to start/what to start with, or good youtube recommendations?