Also spelled "dumbbell" (one word, more common in American English). The "b" before "-bell" is silent in some pronunciations. Used as an insult ("you dumbbell!") meaning "stupid person".
1a short bar with weights on both ends, designed to be lifted with one hand for exercise
He picked up a 20-pound dumbbell and started his bicep curls.
2a long metal bar with adjustable weighted discs on each end, designed to be lifted with both hands for exercise
She loaded 100 kg onto the barbell for her deadlift.
Russian origin; popularized as Western strength-training equipment in the 2000s.
3a cast-iron ball-shaped weight with a single looped handle on top, used for swing-based and ballistic strength exercises
Kettlebell swings work the entire posterior chain.
a flat metal disc loaded onto a barbell or machine to add weight
He slid two 20-kilo weight plates onto each end of the bar.
a thin non-slip mat used as a surface for yoga and floor exercises
Unroll your yoga mat and start in a seated pose.
a stretchy elastic band that adds resistance to strength exercises
She loops a resistance band around her thighs for squats.
a firm foam cylinder you roll your body over to release muscle tightness
Roll your IT band on the foam roller after leg day.
British: skipping rope.
a rope swung over the head and under the feet as a cardio exercise; also the activity itself
Boxers use a jump rope to build footwork and stamina.
Also "ab roller".
a small wheel with a handle through its axle, rolled out and back to train the abdominal muscles
He could barely do ten reps on the ab wheel.
a handheld device that delivers rapid percussive pulses to loosen and relax muscles
She used a massage gun on her sore calves after the run.