What do you think about the step machine? Do you think it will make any result in me? At home I only have that machine and while I'm studying, watching TV or whatever am on it doing steps. I actually haven't the time to go the gym because of the exams, so do you really think is worth it? (or which results should I hope to get?)
There are advantages, and dis-advantages to using machines. I have C&P quote from acefitness, which details reasons pretty well:
"The free-weight disadvantage
- You must learn to balance the weight while exerting force. This can be difficult — and potentially dangerous — if you are lifting weights overhead.
- The isolation of specific muscles can be difficult. To target the muscle you want, you must use very precise technique.
- Free weights can be swung for momentum rather than lifted slowly and steadily, which works the muscles better.
- Training alone can lead to injury if you don't use proper technique.
The machine advantage
- Machines are generally safer and easier to use, an advantage for beginners learning a specific movement.
- Some machines are more efficient than free weights at isolating a specific muscle or muscle group. This is important when you're strengthening a specific body part or rehabilitating an injury.
- Machines ensure correct movements for a lift, which helps prevent cheating when muscle fatigue sets in.
- Machine workouts can take less time because you can move easily from machine to machine. Changing the resistance is easy; you just insert a pin or enter a code.
The machine disadvantage
- Most machines involve moving a weight along a predetermined path, making it difficult to strengthen the stabilizer muscles.
- Machines are much more limited, with most devices allowing only one exercise.
- Most machines are geared to the average-sized person, so if you're shorter or taller than average, you may find it difficult to use some machines. However, some companies have developed equipment that is scaled down to suit many smaller men and women.
Generally speaking, if you are beginning a strength-training program for the first time, or have been away from your program for months or even years, then it's a good idea to try the resistance-training machines for the first 10 to 12 weeks of your program.
Doing so will give your body the time it requires to adjust without putting undue stress on your muscles and joints. Using machines may also be easier and less discouraging if you’re a novice, because free weights require some coordination to use.
Experienced exercisers may want to use free weights because of the additional training benefits they offer. That said, the combination of both free weights and machines can add variety to your workout.
If you are a health club member, be sure to ask the fitness instructor to show you how to use the free weights and machines properly. If you forget how, ask until you feel confident that you are using the proper technique to complete each exercise.
If you are exercising at home, be sure to purchase an exercise tape that outlines the proper technique to follow. Good technique is essential if you want to reach your strength training goals, while avoiding injury."
I'm just trying to do as much exercise at home as I can do... Next month (yes, I'm sadly too busy this month to go to the gym) I'll start it - no option! 
