When you exercise until your muscles can't do any more reps, you feel much more tired and uncomfortable compared to stopping earlier, no matter how heavy or light the weights are.

When people who lift weights for fun push themselves until their muscles can't do any more reps, they feel more tired and worn out compared to when they stop earlier.

Pushing your muscles to complete exhaustion feels way harder than stopping just before you can't do another rep—this extra effort might make you more tired and less likely to stick with your workout routine.

If you lift weights until you can’t do another rep versus stopping before failure—while doing the same total amount of work—you’ll feel more tired and more worn out during the workout, especially if you’re a regular gym-goer.

If you lift weights until you can't do another rep, your body feels like you worked harder than if you stopped before failure—even if you did the same total number of reps and sets.

When you do exercises back-to-back with little rest (pre-exhaustion training), it feels harder than doing exercises with normal rest breaks (traditional training).