8 Things You Need to Know About Your Abs

• Reverse crunch
• Bicycle crunch
• Stability ball crunch

SEE ALSO: 28 Days To Six-Pack Abs Workout

There are 16,870 books dedicated to abs on Amazon. 

SEE ALSO: 5 Ways To Shredded Abs

You should do two ab moves daily, four times per week, at three to four sets of 15 to 25 reps — no more, no less — going heavy, according to Hers technical advisor Gino Caccavale. 

SEE ALSO: Six-Week Power Ab Workout

33.3 percent of external obliques were recruited when exercisers increased their rep speed to one rep per rep. Translation: For hard-gaining abdominal muscles like the external obliques, faster is better. The study from Universidad Miguel Hernandez de Elche measured the effects of rep speed on muscle recruitment and coactivation of the rectus abdominis, internal obliques, external obliques, and erector spinae during curl-ups, at speeds of 4, 2, 1 1/2 and 1 second per repitition. 

SEE ALSO: 7 Best Moves For Crazy Obliques

4 hours, 26 minutes

Longest time spent in a plank pose (record held by Mao Weidong on Sept. 26, 2014)

SEE ALSO: Plank Your Way To Flat Abs

There are sixe number of muscle groups that make up the core.

• 1 Rectus abdominis (trunk flexors)
• 2 Multifidi
• 3 Erector spinae (back extensors)
• 4 Internal obliques
• 5 External obliques
• 6 Transverse abdominis

It takes 4-6 weeks after having a baby that most doctors recommend waiting before doing ab-focused exercises like crunches. 

1.2 Million – the number of times the phrase six-pack is searched for on Google Each month.