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There are many flavors of abs machines available. Find one or two that you like. [ID: abs_mach]
First time: Do 10 reps, starting at a low weight
Adjust your seat so you are comfortable when crunching.
Progressions: More weight, reps, and sets.
Helpful hint: The debate rages on: machines vs free weights, hints.htm#machines_vs_free_weights
Image source: NASM, nasm.org