Do you think your tummy is weak or needs help? I've compiled some core exercise that will help your spine but also six packs along the way
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My clients have specifically shown core strengthening exercise for each progression from basic (level 1) to advance (level 3) that will challenge & enforce the functions of the core
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I suggest to master each exercise before progressing to another exercise. Try to perform each exercise for 2-5 sets of 15-30 seconds work