Group performing standing side lunges on Reformers using long boxes to build leg strength and control This version takes the classic Skater and gives it a twist. The box adds height, support, and a serious challenge to balance and control. One foot stands on the box, the other on the moving carriage. As you press the carriage out, you are not just working the legs, you are asking your hips, core, and stabilisers to hold everything together. The setup makes it safer for some c