Advertisement Each week, Sunday Life's beauty director Stephanie Darling roadtests a different makeup or skincare trend to find out whether it's worth your time. Ahead, a muscle-stimulating treatment for your core, and holiday kits. It aims to stimulate and build muscle tissue and help reduce fat. Credit:iStock Stephanie Darling roadtests a muscle-stimulating treatment to strengthen her core. The lowdown I was intrigued when I heard about the TeslaFormer, a device that uses Functional Magnetic Stimulation to induce up to 50,000 muscle contractions a session. It aims to stimulate and build mu...