As most women would attest, it is almost impossible to take the jiggling out of jogging.
Even the most expensive sports bras can fail to stop the painful bouncing which leads to long-term damage.
But now scientists claim to have found a way to make the perfect scaffolding for every woman's set.
They have developed an "intelligent fabric" to use when testing bra designs in the lab.
Fitted with tiny sensors, the fabric will monitor and measure even the smallest movement in the breast.
This means that manufacturers can better stop the wobble - and also prevent their designs from adding to the problem.
If you take out the jiggle, what fun will it be watching the runners on the river walk outside my building at lunch.
Still, want to see what a jiggling set looks like, run the Shock Absorber Simulation.