You don't need mountain climbers to get a good ab workout.

Image Credit: LaylaBird/E+/GettyImages When it’s time for an ab workout, do you automatically think of mountain climbers and groan a little? They’re one of the most dreaded ab exercises, and while effective, they’re not 100-percent necessary.

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 "Mountain climbers are one popular form of core development, however, there are tons of other exercises that can help you strengthen your abdominal muscles," Warren Kelly, performance coach, mobility specialist and owner of East Coast Strength and Performance, tells LIVESTRONG.com.

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  Here's a handy 20-minute ab workout you can do anywhere, courtesy of Kelly. And we promise, there isn't a single mountain climber!

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  ​Check out more of our ​​20-minute workouts here​​ — we’ve got something for everyone.​
  1. Plank With Alternating Arm Lift Image Credit: Warren Kelly/LIVESTRONG.com

        Sets
    
        3
    
        Time
    
        40 Sec
    
        Region
    
        Core
    

Start in a forearm plank with your elbows under your shoulders and your legs extended behind you. Create tension in your glutes and brace your core. While maintaining a neutral spine, slowly extend your right arm horizontally in front of you. Return to the forearm plank before repeat the movement with your left arm. Perform this move for 40 seconds total. Rest for 20 seconds, then repeat for 3 sets total.

  Show Instructions
  2. Feet-Elevated Side Plank   Image Credit: Warren Kelly/LIVESTRONG.com
      
        Sets
       
        3
      
        Time
       
        30 Sec
      
        Region
       
        Core

Elevate your feet 6 to 16 inches off the floor on a bench, step or chair. Press up into a side plank. Stack your elbow under your shoulder with the opposite hand extended overhead. Make sure your hips are stacked over one another and are in line with your feet and head. Hold for 30 seconds, then repeat on the opposite side. Repeat for 3 sets total.

  Show Instructions
  3. Reverse Crunch   Image Credit: Warren Kelly/LIVESTRONG.com
      
        Sets
       
        3
      
        Time
       
        40 Sec
      
        Region
       
        Core

Like on your back with your knees bent and your arms directly overhead. Grab a dumbbell or kettlebell for counterbalance. You can also use any other sturdy object to stabilize yourself. While bracing your core, peel off one segment of your spine at a time, starting at your lower back. Once your knees come in contact with your elbows, slowly lower one segment of your spine at a time in the opposite direction until you’ve returned to the starting position. Do this for 40 seconds, then rest for 20 seconds. Repeat for a total of 3 sets.

  Show Instructions
  Tip The greatest benefit of this exercise is that it targets the lower portion of your abdominals and promotes a healthy spine, Kelly says.
  1. Body Saw Image Credit: Warren Kelly/LIVESTRONG.com

         Sets
    
         3
    
         Time
    
         40 Sec
    
         Region
    
         Core
    

Start in a forearm plank with your feet on a slider or slide board. While maintaining neutral spine and tension in your glutes, gradually slide your feet away from your arms. Only go as far as your strength and mobility allow. Gradually slide back until your shoulders extend beyond your elbows. Perform this exercise for 40 seconds, then rest for 20 seconds. Repeat for a total of 3 sets.

  Show Instructions
  Tip If you don't have access to a slider or slide board, use a wood floor with socks or a towel.
  1. Hollow Rock Image Credit: Warren Kelly/LIVESTRONG.com

         Sets
    
         3
    
         Time
    
         40 Sec
    
         Region
    
         Core
    

Beginning lying on your back with your arms and legs extended and your core braced. Lift your arms and legs several inches off the floor until you’re in a banana shape. Seesaw in this position, rocking back and forth with minimal movement from the hips and shoulders. Perform this exercise for 40 seconds, then rest for 20 seconds. Repeat for a total of 3 sets.

  Show Instructions
  Tip "Executing a proper hollow rock will increase midline control, which has ample carryover into movements such as push-ups, pull-ups, etc.," Kelly says.
  1. Plank to Side Plank Image Credit: Warren Kelly/LIVESTRONG.com

         Sets
    
         3
    
         Time
    
         40 Sec
    
         Region
    
         Core
    

Start in a forearm plank. Rotate to your right side with your elbow stacked under your shoulder. End in a side plank with your left arm extended toward the ceiling. Return back to a forearm plank. Turn to the left side for a side plank in the opposite direction. Return once more to a forearm plank and continue alternating for 40 seconds. Rest for 20 seconds before repeating for 3 total sets.

  Show Instructions
  Tip "Ensure you maintain a neutral spine throughout each movement, as this will keep tension in your core," Kelly says.

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You don't need mountain climbers to get a good ab workout.

Image Credit: LaylaBird/E+/GettyImages

Image Credit: LaylaBird/E+/GettyImages

​Check out more of our ​​20-minute workouts here​​ — we’ve got something for everyone.​

Image Credit: Warren Kelly/LIVESTRONG.com

        Sets
       
        3
      
        Time
       
        40 Sec
      
        Region
       
        Core

Start in a forearm plank with your elbows under your shoulders and your legs extended behind you. Create tension in your glutes and brace your core. While maintaining a neutral spine, slowly extend your right arm horizontally in front of you. Return to the forearm plank before repeat the movement with your left arm. Perform this move for 40 seconds total. Rest for 20 seconds, then repeat for 3 sets total.

  Show Instructions

Image Credit: Warren Kelly/LIVESTRONG.com

        Sets
       
        3
      
        Time
       
        40 Sec
      
        Region
       
        Core
      


        Sets
       
        3
      
        Time
       
        30 Sec
      
        Region
       
        Core

Elevate your feet 6 to 16 inches off the floor on a bench, step or chair. Press up into a side plank. Stack your elbow under your shoulder with the opposite hand extended overhead. Make sure your hips are stacked over one another and are in line with your feet and head. Hold for 30 seconds, then repeat on the opposite side. Repeat for 3 sets total.

  Show Instructions
  


        Sets
       
        3
      
        Time
       
        30 Sec
      
        Region
       
        Core

Like on your back with your knees bent and your arms directly overhead. Grab a dumbbell or kettlebell for counterbalance. You can also use any other sturdy object to stabilize yourself. While bracing your core, peel off one segment of your spine at a time, starting at your lower back. Once your knees come in contact with your elbows, slowly lower one segment of your spine at a time in the opposite direction until you’ve returned to the starting position. Do this for 40 seconds, then rest for 20 seconds. Repeat for a total of 3 sets.

  Show Instructions

The greatest benefit of this exercise is that it targets the lower portion of your abdominals and promotes a healthy spine, Kelly says.

Start in a forearm plank with your feet on a slider or slide board. While maintaining neutral spine and tension in your glutes, gradually slide your feet away from your arms. Only go as far as your strength and mobility allow. Gradually slide back until your shoulders extend beyond your elbows. Perform this exercise for 40 seconds, then rest for 20 seconds. Repeat for a total of 3 sets.

  Show Instructions

If you don’t have access to a slider or slide board, use a wood floor with socks or a towel.

Beginning lying on your back with your arms and legs extended and your core braced. Lift your arms and legs several inches off the floor until you’re in a banana shape. Seesaw in this position, rocking back and forth with minimal movement from the hips and shoulders. Perform this exercise for 40 seconds, then rest for 20 seconds. Repeat for a total of 3 sets.

  Show Instructions

“Executing a proper hollow rock will increase midline control, which has ample carryover into movements such as push-ups, pull-ups, etc.,” Kelly says.

Start in a forearm plank. Rotate to your right side with your elbow stacked under your shoulder. End in a side plank with your left arm extended toward the ceiling. Return back to a forearm plank. Turn to the left side for a side plank in the opposite direction. Return once more to a forearm plank and continue alternating for 40 seconds. Rest for 20 seconds before repeating for 3 total sets.

  Show Instructions

“Ensure you maintain a neutral spine throughout each movement, as this will keep tension in your core,” Kelly says.