Tennis strings lose tension within 2 weeks but most recreational players have no idea their racket is effectively dead

You get your racket strung at 55 lbs with polyester strings. Within the first 2 hours of play, the strings lose 10-15% of tension (drop to 47-50 lbs). Within 2 weeks of regular play, they are at 40-42 lbs — 24% below your intended tension. The ball pocketing changes, your control decreases, and you compensate by swinging harder, which causes arm pain. You blame your technique. Actually, your racket has been playing like a different racket for the past month because strings lose tension logarithmically and you cannot feel the gradual change. The general rule: restring as many times per year as you play per week. A 3x/week player should restring 3 times per year. Most recreational players restring once per year or when a string breaks. So what? Most recreational players are unknowingly playing with dead strings for 80%+ of the year. The performance difference between fresh strings at 55 lbs and dead strings at 38 lbs is dramatic — equivalent to playing with a completely different racket. Players spend $200-400 on rackets but neglect $20-40 restringing that determines how the racket actually performs. Arm injuries (tennis elbow) are significantly more common among players with dead strings because low tension increases vibration. Why does this persist? There is no consumer-accessible way to measure string tension on a strung racket. Professional stringers have tension calibrators ($200+) but players do not. No racket has a built-in tension indicator. The degradation is gradual enough that players adapt unconsciously. String manufacturers and shops benefit from NOT educating players about tension loss — educated players would restring more often (good for shops) but might also realize expensive strings lose tension just as fast as cheap ones (bad for string manufacturers).