Fit for the festive season – Part 3 (video) By Kaylynn Palm - December 15, 2017 Share on Facebook Tweet on Twitter Assume the push-up position with legs apart. Tuck the right knee to the left elbow and vice versa. Add a running motion to it and feel the core engaging in the movement. Repeat the exercise for 15 reps. We are now in week three of our fitness programme, which means you should already be feeling stronger than you were two weeks ago if you have been following the work outs. The number of exercise reps has increased and have become more challenging.