I'm fat and my skin tends to sag because of losing and gaining weight several ti!

I'm fat and my skin tends to sag because of losing and gaining weight several times,what could I do to tone up

I would like to tone up my arms especially. I walk Monday thru Friday in the early morning for 45min. before I eat. And I also watch what I eat and never eat after 7pm and I am losing weight. The only problem is I would like to tone up but I just dont know where to begin?

First: eat before you exercise, not after. One, because you need the energy, two, because you'll jump-start your metabolism, and three, because eating after you exercise usually means you'll eat more!

I personally find swimming as the best exercise to tone up. I'm not saying this is you, but sometimes people who are overweight feel uncomfortable running or playing sports, well... because the extra fat gets in the way. Size is completely irrelevant in the water and it's much easier to move and exercise effectively.

Now, if you want to bulk up a bit, you'll have to do weight-training. Start slow, with one or two machines, with weights you're comfortable with but that challenge you a bit, doing 3 sets of 12 reps or so. In general, lower number of reps with heavier weights will get you bulkier muscles, and more reps with lighter weights will get you lean muscle.

Good luck and make sure you don't strain yourself. Building muscle takes time and it'll be useless if you kill yourself for 5 days, then pull something and are unable to move for two weeks.