Who it is for · Strength and calisthenics
For anyone who trains with a bar and the floor
No sensor counts pull-ups, which is why most fitness apps ignore them. GritCore has five strength challenges, rep duels, and a leaderboard where a ten-minute plank counts for something.
Strength challenges
| Challenge | Target |
|---|---|
| 100 Pull-ups in a Day | 100 reps inside 24 hours |
| 1000 Push-ups in a Day | 1,000 reps inside 24 hours |
| Ten-Minute Plank | Hold for 10:00 |
| Five-Minute Wall Sit | Hold for 5:00 |
| Three-Minute Dead Hang | Hang for 3:00 |
How are reps and holds verified?
On your honour, with an optional link to a video as proof. People who saw it can vouch for you, and once enough do, the claim shows as witnessed. It is the same trust a training partner gives you, made visible.
How rare is 100 pull-ups?
Nobody has a clean population figure, but the ceiling is known: the 24-hour records stand in the thousands. Read what the evidence says.
Rep duels
Pick reps in a duel and whoever does more pull-ups, push-ups or squats in the window takes the Grit. Totals only go up.
Common questions
Is there an app for calisthenics challenges with friends?
GritCore has rep-based duels and five strength challenges, including 100 pull-ups and 1,000 push-ups in a day. It is free on iPhone and Android.
Is a 10-minute plank rare?
Yes. For reference, the Guinness World Records stand at over 9 hours 38 minutes for men and over 4 hours 30 minutes for women, but a 10-minute hold is far beyond what most people ever attempt.
Sources
- Guinness World Records, longest abdominal plank (male)
- Guinness World Records, longest abdominal plank (female)
World population taken as about 8.1 billion. Checked 30.09.2026.
So how rare are you, actually?
GritCore is free on iPhone and Android.