Use Apple Fitness NOT Fitness+ to Record a Run Walk

WITHOUT using an Apple Watch, how do you use Apple Fitness (NOT Fitness+) on iPhone to Record a Run Walk? Just want to use iPhone Fitness App to record a walk/run. Do not want to use (or pay for) Fitness+ to perform such a simple task. Do not want to use Apple Watch either. Just want to use Apple Fitness (NOT Fitness+) on iPhone to Record a Run Walk.