lightningthin

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  • depends. i normally do around 100 of each, but sometimes i want to focus more on lower abs so i do more reverse crunches and so on. you could start with one 1-minute plank a day and move it up to 3 or 4 over time.
  • crunches, reverse crunches, bicycle crunches, vertical crunches, planks, leg lifts, etc.
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