Training to failure..

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Progressive overload more important than training to failure.

This. I'll ramp weight, running a fixed number of reps, until I can't hit that number of reps (e.g., dl Saturday, 6 reps each at 135/225/315/335 then that last set at 345 I got 3 and complete failure). That last set and couple of reps is what shocks everything for me. But I'm a tall skinny fucker so I'm not representative.