Tips to get a stubborn horse to trot/lope?

Forward! do tight leg grips , lean forward & i do suggest you use a riding crop a couple of times. be firm with a relaxed thought! he is just trying to out do you both! backward; take both hands & hold reins even. gently speak 'back' as you lean backward & pull. if he just makes 1/2 step this is progress. keep this up each day & soon you will be backing!