Start small, you're not going to to run the 3 minute mile in a day nor are you going to start benching two hundo next week. You want to make sure you don't hurt yourself, ask people who work at the gym for advice, and always start with low weight just to the form right, then you can bring it up and see what level you are at. Cardio is good, resistance training is better. Muscle burns a lot of calories. There are plenty of exercises with resistance that can be a good cardio workout as well. If you have a free motion machine, I suggest looking up some exercises you can do with that. Also, don't dipsy doodle around at the gym. Decide going in what you want to focus on that day and stick to it. At least 3 sets per exercise. Going for weight lose and toning, give it about 12 reps a set, that you can do somewhat comfortably.
Diet is important, but everything in moderation. You switch to salads your gonna feel like shit real quickly. Lots of protein, low sugar. You need fats or carbs to break down the protein. Be healthy about it, there are no quick fixes.
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Oh and those weight loss pills they are saying, don't bother, the only known active ingredient in them that does anything is caffeine. Look at the diet pills on the shelf, they all have caffeine in them, cause that keeps you wired and moving more, not healthy and un necessary.
Nem is right, work the major groups. And give it time, shit is not instantaneous, you're building a lifestyle so make sure it is something you can keep up.
I hit Brett right in the feels.