I did this challenge and i started seeing results in my tummy fat each week. I did have a little difficulty doing the spider man plank so i just substituted it with each plank before that one. I challenge each of you to challenge y
I like this pistol squat progression, but i would ad to the last/goal exercise holding a pound plate and doing a front raise with it while performing the pistol squat. This not only adds resistance to the squat movement but it REALLY blasts the core!