3 Positive reinforcement is most effective when it occurs immediately after the behavior. Reinforcement should be presented enthusiastically and should occur frequently. Deliver reinforcement quickly: A shorter time between a behavior and positive reinforcement makes a stronger connection between the two
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I think your answer is either the chain crew or the first down markers.(the chains that the chain crew hold to mark the first down.)
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vitamin D? Im not sure so check in with other people and do some more research.
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