horseshoe

mastery
UK /ˈhɔːs.ʃuː/ US /ˈhɔːɹs.ʃuː/nounverbname

card 1 of 9 · context meaning

What does 'horseshoe' refer to in this fitness context?

The bodybuilder's trainer pointed to the back of his arm and said, 'Your horseshoe is developing beautifully—keep up those tricep exercises and you'll have amazing muscle definition.'