Strength & Power Lab

Experimental Notice: The use of these aggregated computational tools should be considered experimental. Depending on extreme or inconsistent inputs, the models may produce unrealistic or misleading results. Use with caution and critical thinking.
module / strength / 1rm

1RM Repetition & Intensity

Enter a weight in any Rep Max box (kg, lbs or any unit) to estimate others and relative intensities.

module / strength / rsi

Reactive Strength Index (RSI)

Evaluate Stretch-Shortening Cycle (SSC) efficiency and lower-limb stiffness using the Reactive Strength Index.

module / strength / methodology

Repetition Maximum Theory

  • Brzycki Formula: 1RM = weight / (1.0278 - (0.0278 * reps)). Valid for reps < 10.
  • Intensity Scaling: Determining weekly loads based on relative percentage of 1RM.

Reactive Strength Index

  • RSI: Jump Height / Contact Time. Measures explosive efficiency.
  • Stiffness: High RSI often indicates superior lower-limb stiffness and SSC quality.