Synonyms for «to add difficulty»

Synonyms for individual words can be found below.

Add 5 - pound dumbbells or more for added difficulty as you become comfortable. (health.com)
The simplest and most heavily used option is to add a difficulty setting. (gamedesignjunkie.com)
If you find this exercise too easy, you can add some difficulty by holding weights between your feet. (fitnessandpower.com)
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