Tap the Extra Work card. It does two separate things: ask for a session on a day that suits you, and log work you have already done on your own.
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Asking for a session
Under Request Extra Work, pick a date and say what you want to work on, then tap Send Request. This uses no credits — it is a request, and Marcus confirms it. Your requests are listed underneath so you can see what is still waiting on him.
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Logging work you already did
Further down, under Log Extra Work, paste a video link and add a note, then tap Submit. The Hitting MD team can review it and give you feedback.
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Logged work counts
Anything you log feeds your activity ring and your streak — the more you put in on your own, the more it shows. A request does not count until you have actually done the session.