Some thoughts on teaching this punch.
When you start a guy out by telling him to step every time he jabs, you need to stay on top of that. Otherwise he will pick up bad habits like stepping with the left foot but not the right. Or leaning up on the left foot to jab. Both of these are hard habits to break. I would suggest not using the words jab and step together for at least two weeks.
Get them moving. Show them how to move up and back, etc...with hands up. Then a round of the same but with both hands moving, hands and feet independently.
Don't let them hit the jab on the heavy bag yet. Too heavy and it will teach bad mechanics. At this point that bag is to learn the the weight goes to the left foot for right hand punches, to the right for left hand punches. Except the jab so keep them separate.
Just do jab/move drills, keep the feet and jab moving. Your goal here is "loose". You don't say 'step with your jab' until he understands punch mechanics.
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