I am not on this challenge, but if it's the same one as in pilates, it is a VERY difficult move! But you say your LATS hurt? That seems odd. It would be my abs, or my lower back from not having particularly strong abs, that would bother me.
Perhaps you held too much tension in your upper shoulders as you did it? Or just pumped too hard for your current upper body training level?
Also, try keeping your shoulders down and away from your ears as much as possible as our tendency is to let them creep up, creating strain.
My last thought is that maybe you just went down too far and your body was trying to cope with weakness and you simply strained something. If it's really too hard, make a smaller "v"!
Sorry if this is irrelevant or not helpful! Hope it feels better soon!
|12 Days until: Mah Berfday!