Revisit Day 17.   

http://www.damienrochefitness.com/blog/2015/7/8/the-plank-day-1730-plank-jacks

If the basics are easier, today we are going to aim for rounds of 40 seconds. Hold form for full time or break earlier. 

Level 1:  

Choose any level from Day 17, 

or  

3 x 40 sec rounds, rest as needed between. 

Level 2: 

3 x 40 sec rounds, rest 20 sec between. 

Level 3:  

3 x 40 sec Plank jacks followed immediately with 40 sec jogging on the spot, followed by 20 sec rest between. 

So 40:40:20 x 3  

 

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