Currently, only the breasts and butt are targeted, but other parts could be added in the future. Real-Time Body Physics View File Real-Time Body Physics is a highly experimental mod for the Sims 4 that attempts to add real-time body physics to sims.Sometimes the wrong vertices get selected and you'll see bouncing fingers or faces. Real-Time Body Physics is a highly experimental mod for the Sims 4 that attempts to add real-time body physics to sims.