Honestly, it depends on the bench. Most park benches are built for sitting, not for repeated jumping. A typical cheap wooden or light aluminum bench can start loosening at the bolts within weeks if a group of teenagers treats it like a trampoline. The slats flex, the hardware backs out, and eventually you get cracked boards or a wobbly frame.
Heavy-duty commercial benches do much better. A steel frame with thick powder coating, reinforced gussets at stress points, and galvanized or stainless hardware can handle a surprising amount of abuse. Thermoplastic-coated steel slats are also tougher than plain wood or thin aluminum. Some parks specifically install these because they know kids will jump, climb, and skate on everything.
The weak points are almost always the connections. Even a strong bench will fail at the bolts or welds if it’s jumped on constantly. That’s why proper installation matters just as much as the bench itself. A bench that’s bolted down to a concrete pad will stay more solid than one just sitting on grass. Surface mounting with expansion anchors or embedding the legs in concrete makes a big difference.
If you’re trying to choose a bench for a skate park, schoolyard, or bus stop, look for something rated for high-traffic or vandal-resistant use. Avoid benches with thin metal brackets, untreated wood slats, or lightweight frames. Also check whether replacement parts are available. Slats and hardware should be replaceable, because if teens are around, something will eventually need fixing.
So to answer your question: a well-built commercial bench can hold up against teenagers jumping on it for a long time, especially if it’s properly anchored. But no bench is completely indestructible, and regular jumping will shorten its lifespan. If you want it to last, choose heavy-duty materials, bolt it down, and inspect the hardware once in a while.