(Because they seem like a really good shoulder exercise) Everyone is totally obsessed with planks, and some talk about it like it's the "ideal" core exercise, way better than crunches. That it's a perfect example of how to "work the core". I'm not so sure though. . Here are some of my thoughts: 1. Lots of people tell me "my core is weak". When I ask them how they know this they tell me it's because they can't hold a plank for X amount of time. It seems as though the chest,