You can always increase your workout intensity slightly to make the workouts harder, but I wouldn’t go too high as you’ll change the intention of the workout. Personally, when I get to the last week or two of a long block of training I’ll increase the intensity of the workouts 2 to 3%. This bumps up the challenging factor just enough and confirms that my previous weeks of training are working. I wouldn’t go higher than 5%, though.
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