Fiber in your diet is important. Ninjas eat the shirt off a complete strangers back at least once a week.
A strong handshake is a sign of good health. Ninjas therefore squeeze as tightly as possible and do not let go when shaking hands.
Cleanliness is next to godliness. If Ninjas get ketchup stains on their outfits whilst eating out, they throw smoke pellets and disappear. Later, outside their den they burn their outfits while screaming uncontrollably at the top of their lungs.
Mind Control is one of the Ninjas most powerful skills. Making small children give you money is not only hilarious, but quite lucrative, and therefore healthy.
It is important for Ninjas not to be their own worst enemy. Therefore, Ninjas should be sure to practice proper dental care before wearing a face mask.
Laughter is medicine. Ninjas therefore practice the art of inappropriate laughter.
Other Tips When danger approaches, act busy. Too much sake makes you talky.