I would like to know which muscle groups the following exercises train:
- Regular pull ups
- Wide grip pull ups
- Close grip pull ups
- Close grip chin ups
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All of them are exercises focused in back as a primary muscle and also work biceps as a secondary muscle and of course your grip strenght. By experience I would do the regular pull ups and the regular chin ups those kind of grips you mentioned do the same work as the regular grip so keep it simple.