I have done them as well. But usally I do a circuit, something like this:
1. Core roll-out (using a DB bar)
No rest
2. Planks (with progressive time added)
No rest
3. Renegade rows
repeat after 2m rest
__________________
Married 29 years (4/26)
Age: 51
Weight: 168
Height: 5ft 7in
BF%: 8.2%(DEXA)
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After losing 40ish unwanted lbs:
At 152/154lbs:  At 162/164: 
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