Eric Roberts explains that post-workout soreness means your muscles are still adapting to stress. As you get stronger, soreness decreases because your body has learned to handle the load. This lets you train harder and more often, which actually builds more muscle than chasing the burn.
Soreness stopping is actually a graduation. Think of what happens when you first pick up running. You'll put on your shoes and go run a mile or 2. You're gonna come back, you'll have blisters on your feet, shin splints, calves, legs are super sore. But as you get a month into it, you won't be getting blisters, legs won't get as sore. Does that mean you got weaker or worse at running? No. No, you got better. The damage stops because now your body has gotten used to it and knows how to handle it. Your muscles do the exact same thing. Less soreness equals less muscle damage. Less muscle damage means you can train more often with heavier weights, which means you can build more muscle, not less. So don't chase being sore. Chase lifting heavier, doing more reps, and pushing yourself close to failure, because that's what builds muscle.
