Soreness is a poor indicator indeed... But strength and hypertrophy progression does happen while the body heals and recovers. Let's not confuse the OP here.
There are some great high frequency training programs out there, but most of them all have some active recovery strategically planned into them (lighter loads, speed work, etc) to balance it out and allow your body/CNS to recuperate. Even if that means doing a slightly different variation of whatever. However, if you're constantly hitting the same target muscle groups almost every session training close to maxing out under heavy ass loads all the time, you're gonna burn out quick... Or worse, get injured. Point is, intensity, volume and load all need to be factored into a high frequency program, and that is part of recovery and progressing.
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