it's good to workout
and if you're very, very big person this could help you shed some weight
but overall doing abs is good when you have top diet, and are more on a skinny side
because if you wanna have flat belly then it's better to move around more so I'd rather suggest to start learning MEOVV songs choreos and through that lose weight lol
I wish I wasn't this lazy 
Kim Jongkook (GYM JONG KOOK) ☑️
Shim Euddeum (Hip Euddeum) ☑️
Park Jieun (JJ Salon de Fit) ☑️
Who's next?
I'd say she's no stranger to an ab workout.
Others have answered your initial question, however I believe it would be optimal to, maybe once a week, do 100 sit-ups, each very slowly. I assume you're doing them each very quickly in order to achieve the 300 mark, doing this doesn't achieve the best results, even if you do 300 of them. Speed Test https://vidmate.bid/
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