tight abs...?

Yes. Every guy already has a sixpack, but for it to become visible you need to get rid of the layer of fat which covers it up, which means doing cardioexercise like running or swimming.

Crunches will help bulk the muscles up afterwards.

Ugh, some terrible answers here.

You cant tighten a muscle.. a muscle either grows, stays the same, or gets smaller. you cant sculpt, tighten, tone or any of that other crap, spot reduction is a myth!

For more visible,defined abs you need to lower your bodyfat, so yes in theory jogging and skipping would work fine as long as your diet is in check also! you need to be creating a calorie deficit everyday, i.e burning more calories than your body takes in.

As for strengheting and developing your core you should start doing things like squats, weighted sit-ups, dragon flags planks.

Check out http://www.freinsster.com/ on how to get a real six pack!

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wat kind of question is that? of course u need to do sit up and crunches for abs, if it hurts thatsa good, those are called micro tears and they help build muscle, go to a gym or ask ur PE teacher.

no, jogging only works your legs, you will have to do those situps

maby...but it would make you lose weight