According to BodyBuilding.com, barbell curls, weighted bench dips, and cable crunches are resistance exercises that work the biceps, triceps and abdominal muscles, respectively. Resistance training is any exercise that causes muscles to contract against external resistance, including dumbbells and body weight, according to eMedicineHealth.
To complete a barbell curl, hold the barbell with the hands shoulder-width apart and palms facing up, curl the barbell forward, contracting the biceps until the barbell reaches shoulder height, states BodyBuilding.com.
To complete a weighted bench dip, also known as tricep dip, place the hands on one bench, behind the body, and the feet on another bench, in front of the body, states BodyBuilding.com. Next, have a partner place dumbbells or plates on the lap and slowly lower the body to the floor until the arms reach a slightly-less than 90-degree angle.
To complete a cable crunch, kneel below a pulley with a rope attachment, extend the lower back, contract the abdominal muscles and bring the torso near the floor, says BodyBuilding.com.