MariposasProgressive Overload
Progressive overload is the practice of gradually increasing the demand placed on your body over time so that it continues to adapt. The core idea is that your muscles, bones, and cardiovascular system only get stronger or more capable when they're regularly challenged beyond what they've already handled. That challenge can come from adding weight, doing more reps or sets, shortening rest periods, slowing down the tempo of a movement, or increasing training frequency. The nuance most people miss is that 'progressive' does not mean 'constant.' Trying to add weight every single session eventually stalls, and sometimes the smart progression is staying at the same load but cleaning up your form or adding one extra rep across multiple sets. The principle applies equally to cardio, strength training, and mobility work, even though it gets talked about almost exclusively in the context of lifting.
Example
Say a lifter does 3 sets of 8 reps on the bench press with 135 pounds and hits all 24 reps comfortably for two sessions in a row. The next session they bump the weight to 140 pounds, keeping reps and sets the same. That single, measured increase is progressive overload working exactly as intended, small enough to stay technically sound but large enough to signal the body to adapt.