What is it you said? K-Fit is not challenging enough for you? You want an additional 12 week program that will kick your butt? Are you sure? Double checking for you? Yep?
Ok then. Introducing K-Challenge! This 12 week program is similar to K-Fit except for one specific facet – K-Challenge contains some of our most difficult workouts. 
As with K-fit, K-Challenge only needs 4 pieces of equipment: A pull-up bar, a kettlebell, medicine ball, and a physioball. So enjoy. For those of you in the middle of K-Fit, you now have something to look forward to (just in case you needed some extra motivation).