Insanity workout vs Gym

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What would you suggest for a next week start. I eant to lose some belly ft and tone up for my holiday at the very end of July this year. Would tou suggest doing insanity or going to the gym for this???? I find insanity gets repetative yes but has very good benefits! And weights at the gym is good for toning too right along with classes and its a variety! But just wondering what would e best for my holiday coming up :))