One goal. Two people. Loser pays the price.
Pick someone you actually know. Agree on a weekly goal and what the loser owes. Then prove it, every week, to the one person who'll notice if you don't.
Make a pact. Gym, running, weightlifting, or waking up early. You set the target together and sign it — both of you.
Check in with proof. A live photo, taken in the app. Your twin confirms it. No photo roll, no backdating.
Sunday settles it. Whoever fell short owes the card you both agreed to. It goes in the receipt, and the receipt goes in your archive.
Keep the year. Every week you finish banks a photo. Fifty-two of them is a record of the year you actually showed up.