Wear a seat belt when driving.

Don't smoke.

Practice safe sex.

Safe bet. These significantly increase your life and health expectations at almost no cost.

Save 10% of your income through your pension plan's index fund option.

This heavily depends on your age, country, social level (which affects future discounting) and what not and is thus in its generality questionable.

Sign up for cryonics.

I don't know what kind of advice this is. Sure you are convinced that it may be right for you, but it is as far away from item 2) above as it can be.

From the standpoint of normal people cryonics is not very different from other afterlife memes and thus adding it to the list has the risk of descrediting (to normal people) the whole list.