Reddit - How can I give myself a physical?

What can I do regularly between yearly check-ups to ensure that I am healthy forever (or at least give me early warning to go see the doctor)? Things I do already (I'm a 25 y.o. dude):

• fondle my balls in the shower. You know, to check for lumps and everything.

• watch out for new moles or changes to the size and shape of existing ones.

Is there anything else that I could be doing to monitor my health and check for early warning signs?