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The plank (also called a front hold, hover, or abdominal bridge) is an isometric core strength exercise that involves maintaining a difficult position for extended periods of time. The most common plank is the front plank which is held in a push-up position with the body's weight borne on forearms, elbows, and toes.

Many variations exist such as the side plank and the reverse plank.The plank is commonly practiced in pilates and yoga, and by those training forboxing and other sports.

The plank strengthens the abdominals, back, and shoulders. Muscles involved in the front plank include:

Primary muscles: erector spinae, rectus abdominis (abs), and transverse abdominus.[citation needed]

Secondary muscles (synergists/segmental stabilizers): trapezius (traps), rhomboids, rotator cuff, the anterior, medial, and posterior deltoid muscles(delts), pectorals (pecs), serratus anterior, gluteus maximus (glutes), quadriceps (quads), and gastrocnemius.

Muscles involved in the side plank include:

Primary: transversus abdominis muscle, gluteus medius and gluteus minimus muscles (abductors), the adductor muscles of the hip, and the external, and internal obliques.

Secondary: gluteus maximus (glutes), quadriceps (quads), and hamstrings.

The current world record (according to Guinness World Records) for the plank position is 3 hours, 7 minutes and 15 seconds set in Newport, Kentucky on 20 April 2013 by George Hood.On June 13, 2014 a Danish news paper reported that 51 year old fitness instructor Tom Hoel broke this record in Frederikssund by holding the plank position for 3 hours and 8 minutes.

On June 24, 2014 China Daily USA reported that George Hood maintained his body in the physically demanding plank position for four hours and one minute on June 23,2014 which broke the Guinness World Record for "longest time in an abdominal plank position", smashing his own previous record of three hours and seven minutes set in 2013.

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