// 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.
Effective load
100%
Effort force
392 N
Phase
eccentric
Scrub the rep to read the joint.
Effort across the rangeF = F_g·cosθ
0° (bottom · hardest)90° (top · easy)
Eccentric impulseF_eff × time
Slow the negative to bank more.
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.