They conjure up a world of plump girls urging their equally plump ponies over the jumps at their local gymkhana.
But it now appears that life is increasingly imitating the much-loved cartoons of Norman Thelwell.
Vets and animal welfare officials have warned they are increasingly concerned by the sight of riders who are simply too heavy for their steeds.
Experts believe the problem is caused both by riders becoming too fat and choosing the wrong size horse to ride.
British show jumping authorities have now launched a study to determine the maximum weight a rider should be in proportion to their horse.
That would allow show officials to disqualify or exclude riders who are clearly too heavy for their animal... READ MORE