Should my kid play other sports too, or just focus on fencing if they want to get really good?
Keep at least one other sport or active hobby going until the mid-teens, even for a kid with big fencing goals. Sports medicine is unusually clear on this. The American Academy of Pediatrics recommends delaying intense training in a single sport until about age 15 or 16 to lower the risk of overuse injury, stress and burnout, and the American Medical Society for Sports Medicine says there is no evidence that early specialization leads to long-term success in most sports. USA Fencing's own athlete development model agrees: it encourages multisport play through the ages 6 to 12 and 11 to 16 stages, and treats specialization as something for some athletes from about 14 on.
Fencing has particular reasons to take this seriously. It is lopsided: the same front leg lunges thousands of times, the same arm holds the weapon, and the body twists the same way every bout. The season also runs almost all year, so there is no natural off-season to recover. Other sports fill the gaps: running and changing direction, jumping, throwing, using both sides of the body. Coaches call the result physical literacy, and it is what lets a teenager absorb hard fencing training later without breaking down. A kid who steps away now and then also tends to come back hungrier.
On how much is too much, the AAP suggests at least one or two days a week off from organized training in any sport, and about a month away from the main sport at least three times a year, staying active in other ways. Orthopedic sports medicine specialists advise keeping a close eye on kids who train more hours a week than their age in years, or more than 16 hours a week of intense training. Five fencing days a week for a pre-teen is worth a talk with the coach. Watch for aches that linger, dread before practice, poor sleep, or a kid who used to love it going flat.
Pick the second activity for fun, not as fencing homework. Seasonal sports such as soccer, swimming, tennis, basketball or track fit around a year-round fencing calendar, and martial arts or dance build footwork and rhythm. During that sport's season, trim fencing days rather than stacking everything on top. If your fencer resists cutting back, a compromise like one season a year or a summer of something else usually lands. Around 15 or 16, a teen chasing national results can narrow down, ideally with strength training and planned rest built in.