This is part of my 400m training... explain it too me please?

Question

what is a easy stride?

Answer 1

Its a bit stronger than a jog pace.  In a stride you want to slightly exaggerate your form to train your muscles to "remember" it.  Maintaining your form for the 400m is crucial for this event as you may have already experienced that your running form can fall apart in the home stretch of a race.