playing. is built on a plain idea backed by uncomfortable evidence: most of what youth-sport tools do — scores, streaks, rankings, comparison — works against a developing athlete. These are short notes on why, drawn from the research.
They’re also why the app refuses the things every other tool sells.
If a football-playing kid between about 8 and 14 has heel pain — during training, after it, or first thing in the morning — the most common cause has a scary name and a mostly unscary story: Sever’s disease (calcaneal apophysitis). It isn’t a disease. It’s an irritation of the growth plate at the back of the heel, where a strong, often-tight calf pulls on a bone that is still growing. ...
Almost every youth-sport app keeps score in some way — streaks, ratings, leaderboards, “you’re 12% above average.” It’s good for engagement. It’s bad for a twelve-year-old. Three reasons, all well-established in the development research. Comparison rewards the early-born, not the better player. In any single age group, the kids born just after the cut-off are up to a year older — bigger, faster, further into puberty. Selection and rankings pick them out again and again (the relative age effect), and the late-born and late-maturing get filtered out before they’ve had time to become who they’ll be. A scoreboard bakes this bias in. ...