Officially introduce yourself to the community by sharing your goals, obstacles or accomplishments. Don't be shy.. we're all here for the same reason. The more support we share the easier it will be to reach our goals!
Which particular exercise? there are lots of sites that have exercise demos, do a google search. This site has demonstartions, but that might be a pro feature.
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A man of sense is never discouraged by difficulties; he redoubles his industry and his diligence, he perseveres and infallibly prevails at last.