// AI FORCE ANALYSIS
Lift Lab
One lift, one read. Scrub the joint angle and watch what the working joint actually feels — gravity in red, your effort in green. The eccentric brakes; the concentric drives.
How your AI reads this
Force model — gravity projected onto the working segment: F_eff = F_g · cos(θ), where θ is the joint angle from horizontal. The bar feels heaviest at the bottom (0°) and lightest at lockout (90°).
Eccentric impulse — F_eff × tempo duration. Slowing the negative increases time-under-tension, which drives muscle damage and hypertrophy stimulus.
Single-joint simplification — real lifts involve multi-joint kinematics; this model isolates one joint for legibility. Training guidance only.
Continue exploring
Logging: Not required. Lift Lab uses the selected built-in exercise, entered load, joint angle, phase, and eccentric tempo.
Next tools: Force-Time Curve · Periodization Architect · Volume Verdict
Atlas exercises built into Lift Lab: Barbell curl · Barbell bench press · Back squat