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Here's what you need to know...
If you've never used linear progression on basic chin-ups, you've left a "gap" in your development that's just waiting to be filled.
By performing frequent, non-failure, chin-up work and a once-per-week 5-minute challenge, you'll gain at least half an inch on the upper arms alone.
Following this volume cycle with a strength cycle can add another half inch to your upper arms along with developing a stronger, harder, more athletic upper body.