Squats are a staple of any effective workout routine — and at the end of this challenge, you'll be able to do 100 of them! Every week, you'll get an email telling you how many squats to do each day, starting with just 10 and building your way up — plus tips on proper technique from personal trainer Rob Sulaver, C.S.C.S., founder of Bandana Training in New York City. You'll have stronger quads, killer glutes, hammies that know how to work, and a more stable core before you know it.