When something says 1x5, it means a pyramid like Verb said. Using bench for example, say on that particular day your target weight is 315 for 5 reps on you 5th set...So for someone relatively new to lifting, they might use more increments like:
245x5, 265x5, 285x5, 295x5, then 315x5...If you hit all 5 reps of 315, bump up the weight 5-10 pounds for next week's 1x5. Now, for more advanced lifters, they might keep the pyramid close to the target weight: 265x5, 275x5, 285x5, 295x5, 315x5...

With alot of this program, there's some 1x5's and 5x5's. These are completely different from one another even though it's the same lift. In one given week for bench, you might have a target of 315lbs for your 1x5 pyramid, and for the end of the week's 5x5 (same weight) you'd use 275 for every set.

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