That has been one of the reasons why some can work the Warmlites and others cannot.
I shot this silly little video to show what happens if the right peg is used and inserted correctly :
(I am only 70kg and need to practice my push-ups...)
as the review on stakes here at BPL has pointed out , the longer stakes have a better grip (funny that) and the Y type work particularly .
Of course at times you will have loose soil or sand, in that case there are some good tips here :