Definition of cofferdam - a watertight enclosure pumped dry to permit construction work below the waterline, as when building bridges or repairing a ship. Definition of cofferdam - a watertight enclosure pumped dry to permit construction work below the waterline, as when building bridges or repairing a ship.
Named Muscles. The specific primary muscles used in a deadlift are the erector spinae, gluteus maximus, quadriceps, hamstrings and adductors. The secondary or stabilizing muscles are the trapezius, rhomboids, flexors, extensors, serratus anterior, rectus abdominus, transverse abdominus, gluteus medius/minimus, soleus and the gastrocnemius.
There are variations of the deadlift, such as the sumo, which uses a wider stance that places less stress on the back and helps keep the torso more upright and straight. A sumo deadlift works the hip and groin muscles more than the conventional style. Any deadlift can be done with either a barbell or dumbbells. You start a barbell deadlift with your feet under the bar and roll it up your shins and thighs. You hold dumbbells at your sides, but the lift is similar.