Medicine Ball Slam

Move · Resistance Training · Movement, Typed Supps

There is no lowering phase — the ball leaves your hands, so every rep is pure acceleration with nothing to catch.

Stage by stage

Set-up (Overhead pre-stretch): Full reach lengthens the abdominals and lats, allowing a stretch-shortening contribution on the reversal.
During the rep (Rate of force development): Maximal-intent trunk flexion trains the slope of the force-time curve rather than peak force.
Immediately after (Little eccentric damage): Releasing the ball removes the deceleration phase, so soreness is low and frequency can be higher.
Late in the set (Velocity drops first): Speed falls before effort does — past about ten reps the power stimulus is gone and only fatigue remains.

Muscles trained

Primary: abs, lats
Secondary: glutes, lower back, shoulders, triceps

Intensity

8 METs (Calisthenics (e.g., push ups, sit ups, pull-ups, jumping jacks), vigorous effort).

Time to effect

Weeks: Hip-to-ab timing improves and the throw stops relying on the arms alone, producing a noticeably harder slam.
Months: Throw velocity and tolerated ball weight both increase, alongside measurable gains in anaerobic conditioning capacity.

Common myth

“Slams are just a cardio finisher, not real strength training.” In reality: Because the movement trains rate of force development, how quickly the abs and lats can generate force, rather than just how much force they can produce, slams add a power-training stimulus that slow-tempo core work does not replicate, on top of a genuine conditioning effect.