i think concept is right. these things are basically shoes with a raised "ball of your foot". when you use them and try not to have your heel touch the ground, you are strengthening your calves.
Jst use regular running shoes, lol. Be more specific in what your body is like now and what you want to change. Add muscle, lose fat.
To add muscle the easiest and cheapest thing to get is an adjustable dumbell set from a sporting goods store. I got mine from galyans for around $40. it can adjust up to 20lbs a dumbell. I bought more plates for like $2. I can now use up to 32 1/2 lb each. you can do curls, pushups and skull crushers (very basic, skull crushers are awesome for adding mass to triceps. all together this will strengthen chest, biceps, and triceps.) you can also do many more things with just dumbells. after a month you should totally notice the difference. just make sure you eat enough protein.
if you want to lose fat, just eat less calories and exercise. very simple. walk or run. I am not eating many carbohydrates or fat now and am going to see how that works out. if you burn or eliminate 3500 calories from your diet, you will lose one pound of fat. eat healthier and exercise for a while and the calories will add up.
In the past month, not being too strict about fat, and not even paying attention to carbs i have lost 10lbs. what was more important is I added quite a bit of muscle to bring my bf down to 23% from 27%. That was with a bit of exercise. I walked about 3 miles, 4 times a week. And did pushups, curls, skullcrushers, then military press, standing row, bent over row (not sure what called, strengthens upper back, delts i think), and barbell front raises alternating days. I had a pattern setup so I was alternating during weekdays. mwf i did the first 3 things. tues/thurs i did the others. This way i didnt get sore and let my muscles have time to grow.
I am now in good enough shape that I can jog for quite a while now. I am now jogging every day I can for about 40minutes. with walking breaks when I get tired. I am happy with the mass I have now, so I am only focusing on doing cardio to get rid of the fat. Lifting weights at the same time uses too much energy for me. I am going to do this while eating close to no carbohydrates for the next 2 weeks and see how it goes. I am not doing that atkins **** where you eat tons of fat and red meat because that is very unhealthy. I am eating fewer carbs, not completely none. Your body needs these things. That is why it is at te BOTTOM of the food pyramid, hahha.
Goodluck. Make a plan and stick to it. right out a weekly exercise plan and it will be easier. dont eat junk food or fast food. its pretty easy for me to do. just get the people around you not to bring that crap into the house in the first place.