The guy I'm trying to work with now demands a heel strike, but with the foot directly under the body. Oh my goodness my feet do not want to do that. I can't pick my toes up enough to not slap my feet and thud along. I'm trying to decide if this is worth it.

(He's certainly knowledgeable - about how he runs - but I'm not sure it's going to work for me. Or whether it's worth it to retrain myself).