The honest answer

Casual roundnet is about as risky as any garden ball game. Competitive roundnet is not, because competitive players dive, and diving is not an optional advanced move. It arrives in the first month for anyone who enjoys the game.

So the risk profile is entirely decided by how hard people go for the ball, and that is something you control by choosing the surface and setting the tone.

What actually happens to people

  • Fingers and thumbs. The most common complaint in the sport. A ball arriving fast onto a badly angled hand jams a finger. It is not serious and it is annoying for two weeks.
  • Forearms and knees. From going to ground. On sand nothing happens, on grass you get grass burn, on concrete you lose skin.
  • Shoulders. From hitting, over time rather than in one moment. It is an overuse problem, not an accident, and it belongs to people playing several times a week.
  • Collisions. Four people move around one net with no lines between them. Partners run into each other, and opponents occasionally do too.

That is the list. Nothing on it is exotic, and nothing on it is a reason to keep a set in the cupboard.

The three things that remove most of the risk

Pick a soft surface. Sand first, grass second, sports hall third. Concrete and asphalt look fine until somebody dives, and somebody always dives. That decision is covered in more detail on where to play.

Soften the ball. Lower pressure means slower ball, which means fewer jammed fingers and less sting. Ten seconds of work.

Talk. Most collisions between partners happen in silence. Calling for the ball is not politeness, it is the collision-avoidance system, and it is the first habit I teach in a group.

Children and older players

For children, the two adjustments that matter are the softer ball and a gentle serve. A hard serve at a child's face is the only genuinely unpleasant thing that happens in a family game, and it is entirely preventable by whoever is serving.

For grandparents, the honest answer is that this game involves bending down a lot. Every ball is below waist height. If bending and getting back up is a problem, roundnet will be a problem, and no rule change fixes that.

What does work is a defined role. Put the older player in a position where the ball comes to them at a reasonable height, keep the rally slow, and let them play the set rather than the dive. Plenty of people play into their sixties and beyond, and they play a different game to the one you see on Instagram.

Warming up, briefly

Two minutes of movement beats no minutes, and that is the entire realistic advice for a garden game. Get the shoulders moving before anyone serves hard, and get the legs moving before anyone changes direction quickly.

For people playing regularly, the shoulder is the joint to look after, because hitting loads it repeatedly and nothing else in the game does. That is a training question rather than a safety question, and it is one of the areas where coaching earns its keep.