@juanmz28 everyone else explained teh acronym but I will tell you what they are and why they might be something to consider in your training.
LLP is when you do partial reps when the muscle is at its most lengthened state. So this would be like the top half of the lat pulldown, or the first half a leg curl or leg extension. There is emerging evidence (albeit its still pretty new) that partial at the lengthened position may give more hypertrophy than full range of motion. The evidence is not strong enough to say throw out doing full ROM altogether and just do LLP, but you might want to throw in an extra set where you just do LLP, or after you fail your last set, immediately do some LLP.
This also can inform exercise selection. You would only do LLP on exercises where its hardest at the shortened position, like the exercises I already mentioned. There are some exercises where its hardest at the lengthened position already like squats, or dumbbell presses (if you actually pause at the bottom).
You may also want to preferentially choose exercises that stretch the muscles more. Incline dumbbell curls is a classic example of this. It just stretches your biceps more than other variations. Seated leg curls is another example, you get more stretch versus lying.
all of this being said, if you're new, don't worry too much about this stuff. When you're new everything works. Just follow a preset program without thinking about the why too much. And honestly even if this LLP thing turns out to be better, we're probably talking a 3% to 10% difference over the lifetime. If it was a huge influence we would have discovered it before it now.
LLP is when you do partial reps when the muscle is at its most lengthened state. So this would be like the top half of the lat pulldown, or the first half a leg curl or leg extension. There is emerging evidence (albeit its still pretty new) that partial at the lengthened position may give more hypertrophy than full range of motion. The evidence is not strong enough to say throw out doing full ROM altogether and just do LLP, but you might want to throw in an extra set where you just do LLP, or after you fail your last set, immediately do some LLP.
This also can inform exercise selection. You would only do LLP on exercises where its hardest at the shortened position, like the exercises I already mentioned. There are some exercises where its hardest at the lengthened position already like squats, or dumbbell presses (if you actually pause at the bottom).
You may also want to preferentially choose exercises that stretch the muscles more. Incline dumbbell curls is a classic example of this. It just stretches your biceps more than other variations. Seated leg curls is another example, you get more stretch versus lying.
all of this being said, if you're new, don't worry too much about this stuff. When you're new everything works. Just follow a preset program without thinking about the why too much. And honestly even if this LLP thing turns out to be better, we're probably talking a 3% to 10% difference over the lifetime. If it was a huge influence we would have discovered it before it now.