چقدر باید سنگین تمرین کنیم؟ | شدت تمرین واقعاً یعنی چی؟

Key idea: “Heavy training” is a misleading concept

The video argues that telling people “don’t lift heavy” (or “lift heavy”) is based on a misunderstood, relative idea of weight.

• Weight isn’t absolute—what’s “heavy” for one person can be easy for another.
• Even the same weight can feel different depending on exercise angle and range of motion (ROM).

What actually matters for muscle growth: meaningful intensity

Muscle building requires a stimulus that triggers mechanosensors and leads to protein synthesis. To make that stimulus effective, intensity must be high enough to matter to your muscles.

Practical framework:

• Use a repetition range that supports hypertrophy:
  • ~5 to 30 reps per set can work for muscle growth.
• Choose a load based on effort/intensity, not the label “heavy.”
• Use good technique + correct ROM, with a load that produces the right level of effort.

How to set the “right” weight (instead of heavy/light)

The instructor recommends translating “intensity” (a qualitative idea) into a quantitative target using reps in reserve.

Rule of thumb:

• Pick a load so that at the end of the set, you still have ~2–3 reps left before failure.
• This is commonly tracked as RIR (Reps In Reserve).

Further guidance mentioned:

• Science cited that reserve targets should generally fall in the rough zone of 4, 3, 2, or 1 RIR (not every set needs to be pushed to absolute failure).

“Severe/intense” instead of “heavy”

The video proposes using “severe” (intense) rather than “heavy,” because “heavy” is too relative.

• A weight may be impressive for you, but it only becomes effective when you use it intensely—meaning you stop with the correct number of reps left in reserve, using correct form and ROM.

Core takeaway

• Train hard / intensely, not based on whether the weight feels “heavy.”
• Your goal is meaningful mechanical tension, expressed by:
  • appropriate rep ranges (5–30),
  • proper technique and ROM,
  • finishing sets with ~2–3 reps in reserve (or within a typical RIR range).

Presenters / Sources

• Presenter: Hooman (host of the channel)
• Sources cited (general): References like “science has come to the conclusion…” / “It has shown…” (no specific studies or authors named in the subtitles)