PlanFit said to do it with 2kg, so I thought, "What?! Are you looking down on me?" I considered increasing it to 6kg, but after reading comments about being underestimated, I got scared and lifted 4kg. After finishing one set and putting down the dumbbells, I thought, "This is doable," but when I picked up my phone to start the rest timer, my hands started to tremble. Oh shoot!