What kind of exercises can I do to have flat and toned abs?

If you want to have flat and toned abs it is necessary to reduce abdominal fat levels. Specific exercises for abs are certainly useful to burn these fat stores, but it is fundamental to do also other types of exercises to achieve a good balance between lean and fat body mass. It is very useful to train this muscle tissue regularly, doing exercises for all the abdominal muscles. Each kind of these exercises (from crunch, to lat machine, to sit ups) must be done correctly to avoid any physical issue: it is necessary, at least during the first sessions, to be trained by a skilled personal trainer.