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PlankPact
The plank app where quitting hurts someone else too.
Before building PlankPact, we ran a simple experiment. We paired 14 strangers on WhatsApp and gave them one task: do a plank every day for 7 days. If your partner quits — you both lose. All 7 pairs completed the challenge. 3 continued on their own. That experiment became this app. Research shows we're more afraid of letting someone down than failing ourselves. That's the entire mechanic behind PlankPact.
Fitness has always been a love–hate relationship for me. On one hand, I know it’s good for me. On the other, my discipline has never been great. I start commitments with myself — running, push-ups, yoga, the gym — and sooner or later my routine derails.
This problem has been with me for as long as I can remember. I tried to solve it in every way I knew. I read motivation books like Atomic Habits, tested systems, tricks, frameworks. None of it really clicked. Those methods just weren’t built for how I actually live.
Then one day, a simple idea appeared. I suggested to a friend that we do a 7-day challenge. Every day, we would do a plank — any duration, no rules — and send each other the time on WhatsApp. If someone forgot, we’d remind each other. No pressure. Just presence and support.
We started. And something unexpected happened. Almost overnight, my routine finally had a place to land. We finished the 7 days. Then we extended it by another 7. Then another. Neither of us wanted to disappoint the other person. The support, encouragement, jokes, and small check-ins made it easier — even on hard days.
That’s when I realized I had stumbled onto something important.
I wanted to know if this worked only for us — or if it worked for others too. So I ran a test. I gathered a group of strangers online, paired them up, and asked them to do the exact same thing for 7 days, using WhatsApp.
Every single pair finished the challenge. No one quit. Two pairs kept going for weeks.
The feedback surprised everyone — including me. People couldn’t believe that for the first time in their lives, they completed a fitness challenge — and actually enjoyed it. Friendships formed. It felt light. Human. Real.
That was the moment I knew Plank Pact had to exist. And now, you can be part of that story too.
About PlankPact on Product Hunt
“The plank app where quitting hurts someone else too.”
PlankPact was submitted on Product Hunt and earned 10 upvotes and 4 comments, placing #90 on the daily leaderboard. Before building PlankPact, we ran a simple experiment. We paired 14 strangers on WhatsApp and gave them one task: do a plank every day for 7 days. If your partner quits — you both lose. All 7 pairs completed the challenge. 3 continued on their own. That experiment became this app. Research shows we're more afraid of letting someone down than failing ourselves. That's the entire mechanic behind PlankPact.
On the analytics side, PlankPact competes within Health & Fitness, Productivity and Fitness — topics that collectively have 736.1k followers on Product Hunt. The dashboard above tracks how PlankPact performed against the three products that launched closest to it on the same day.
Who hunted PlankPact?
PlankPact was hunted by Jarek Kaniewski. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of PlankPact including community comment highlights and product details, visit the product overview.
Jarek Kaniewski