Abstract: Hollow-core photonic bandgap fibers (HC-PBFs) demonstrate exceptional performance with high damage threshold, low nonlinearity, low thermal sensitivity and ultralow bending loss. However, ...

I don’t love planks. There I said it. Isometric exercises (or holding one position) are not my thing. I prefer other types of core exercises (hi dead bugs, bicycle crunches, inchworms ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Some abs exercises can get a little tedious the more you do them, including planks.

Some abs exercises can get a little tedious the more you do them, including planks. Thankfully, there are a few ways you can get a good abs pump and continue to develop core muscle without setting ...