The best replacement for bulking up is toning.

The best alternatives to bulking up are rated as following:
★★★★★  toning
★★  toning up
★  getting cut

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Speaking about bulking up, one probably shouldn't forget about weights.

Other search terms related to bulking up and their ratings are:
★★★★★ weights
★★ crossfit
★★ cardio
★ lifting weights
★ muscle
heavy weights
push ups
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Google Trends

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bulking up
toning
toning up