You have to look at the individual design. Shure typically use reassuring thick cable, but my Westone UM2 as typical across their line, utilises thin braided cabling that is virtually microphonics free as well as being intact 2 years later (purchased second hand) and it held up just as well with my old Shure's
In contrast I had 3 pairs of Sony EX71 suffer right driver failure but no issues with 4 other canals', including the CX300 (now sold). Looking at cable design you have to look at the plug and how they go into the ear driver... sometimes they just go straight into the housing 'naked' and are asking for a tug to break
As for gym use, I have ordered Sennheiser PMX 80 off Amazon for stay-on-ability and as they are cited as sweat-proof. I'll soon see when I run 10k with them

(no post now due to Easter -_-)