Running? I don't like carrying keys

You don't have a place to put a single key, but you do lug along a smartphone to unlock the door again? Just put the key wherever you put the smartphone.

My running pants came with a special key pocket. Before that I just hung a spare key on an old shoelace around my neck.

A proper programmable lock would let you set a temporary password. You could then leave the house wearing just some cheap clothes and get back into your house even if someone stole your clothes while you were swimming in the lake. Sounds good to me. No smartphone. No Internet. No surveillance.

There would be a high-entropy emergency password in a sealed envelope hidden in your brother's house in case you ever locked yourself out.

But I don't think the market will produce secure programmable locks at a reasonable price until some government regulator lays down a standard that manufacturers can follow.

hmm...

Carrying a smartphone vs carrying a smartphone and a key chain.

I wonder which is preferable..

I just use a code.

Don't you carry at least an ID card? Most keys are much smaller than an ID card, taking the key out of the keyring and putting it together with the ID card would only make the resulting package a bit thicker.

Why would you carry ID when out for a run? When I was a regular runner I just had a loose (i.e. not on a key chain) copy of my house key that I took with me.