Of course, cardio is an important part of fitness too, but the benefits of strength training are major. Strength training helps build muscle, and lean muscle is better at burning calories when the body is at rest, which is important whether you're trying to lose weight or maintain it. It also helps strengthens joints and bones, avoid injury, improve your muscular endurance, and will help you give it your all during your other workouts, whether that means setting a new PR if you're a runner or pushing (and pulling) a little harder with your legs during your favorite indoor cycling class.
Note the flexibility here. If you're an experienced casual lifter starting an organized program, you may be able to kick off with 3 X 12 from the beginning. If you are new to weights and have some fitness issues, you should start with one set and progress slowly. Doing only 1 set of 9 exercises will not take too long, perhaps only 30 minutes with warmup included. Doing an extra 20 minutes or more of cardio before or after weights would be time well spent at this stage. Once you reach full stretch in the program, aerobic training may be better done before weights or at a separate session.
The first way is to do two exercises for the same muscle group at once (like in the Pre-Exhaustion technique). The drawback to this technique is that you will not be as strong as you usually are on the second exercise. The second and best way to superset is by pairing exercises of opposing muscle groups, antagonist groups, such as Chest & Back, Thighs & Hamstrings, Biceps & Triceps, Front Delts & Rear Delts, Upper Abs and Lower Abs. When pairing antagonistic exercises, there is no drop in strength whatsoever. As a matter of fact, sometimes our strength goes up due to the fact that the blood in the opposite muscle group helps you perform the other. For instance, if you superset dumbbell curls with triceps extensions, the blood in the biceps help you to do more weight in the triceps extensions.
Learn them, and 70% of your battle's already been won. These basics are a must for any serious lifter/athlete to build a basic strength and physique base. Similarly, compound/multi-joint movements are always the "bread and butter" for every good training program – learn them, master them, repeat them, and improve them! Keep in mind that sometimes a workout of 10 sets of heavy deadlifts or squats will give you a better workout than any "fancy" leg/back session.
Eat the right amounts and types of carbohydrates: To figure out your carbohydrate needs, multiply your lean body mass (fat-free body weight) by 0.8 and that will give you the total grams of carbs you need to consume per day. Divide that number by 3 and that equals the amount of carbohydrate grams you will have for Meal 1, on your meal prior to the workout and on your meal after the workout. Since we are emphasizing fat loss, stick to low glycemic carbohydrates (such as oatmeal, brown rice, grits, and sweet potatoes), except for the post workout meal where a high glycemic carbohydrate such as cream of rice is more desirable.
You will start with 1 set of 12 repetitions for each of 9 exercises for the first week. At workout session 8, you should have progressed to 3 sets of 12 repetitions for each exercise. The weight you choose to start with will be sufficient to perform a set of 12 repetitions to failure with good form, which means that the twelfth repetition is pretty much the most you can do without resting. This is called 12RM (repetition maximum).
Reverse crunch: Lie flat on the floor with your lower back pressed to the ground. Put your hands beside your head or extend them out flat to your sides—whatever feels most comfortable. Crossing your feet at the ankles, lift your feet off the ground to the point where your knees create a 90-degree angle. Once in this position, press your lower back on the floor as you contract your abdominal muscles. Your hips will slightly rotate, and your legs will reach toward the ceiling with each contraction. Exhale as you contract, and inhale as you return to the starting position.