I work out approx 3 times a week in a gym but only muscle training, as suggested spinning or other classes one can attend at the gym are fine for cardio, but I personally favour running and excercising outside. If you have a hard time finding the motivation then I'd suggest attending a class, but my suggestion for you is to find a training-buddy, if none of your friends are up for it usually a gym will have a programme that can introduce you to one.
I went through a couple of buddies using said programme but the guy I work out with now I've been working out with for 5 years and that has been enough to motivate me to keep training and enjoy it
Also since you mentioned your quite thin one of the best things you can do is to make subtle changes to your diet: eat more protein, chicken, lean fish and so forth (go look it up on the amazing web), emphasize on subtle, its never smart to radically change diet since it will almost never work. Eating slightly more meat (read protein if your a vegetarian) is easy, and it keeps one from falling into the trap that many new people to gyms fall into - buying protein powder and overusing it, which can give wierd results; especially when your not aqquainted with muscle training. Progress is slow at start but it is supposed to be.
Best of luck
I went through a couple of buddies using said programme but the guy I work out with now I've been working out with for 5 years and that has been enough to motivate me to keep training and enjoy it
Also since you mentioned your quite thin one of the best things you can do is to make subtle changes to your diet: eat more protein, chicken, lean fish and so forth (go look it up on the amazing web), emphasize on subtle, its never smart to radically change diet since it will almost never work. Eating slightly more meat (read protein if your a vegetarian) is easy, and it keeps one from falling into the trap that many new people to gyms fall into - buying protein powder and overusing it, which can give wierd results; especially when your not aqquainted with muscle training. Progress is slow at start but it is supposed to be.
Best of luck