What the hell is with these nutrition guys saying gummy bears are the best thing ever post workout?

I've put 20lbs on this last cycle.  I used to do 7:30 splits on my 5k.   I started focusing less on cardio and more on lifting.  Now when i try to run I get lower back pain that all but cripples me after about a mile.  also i'm getting some calf and shin pain. 

i use custom orthotics and proper footwear being in the orthopedic shoe business.  the only thing i can think of is all the weight i've gained.  what can i do to get my running ability back!?  will i have to lose some of this mass to be comfortable?!

Hi,

I am trying to progress onto doing hanging leg raises however I seem to be either feeling this more so in my legs more than my lower abs. 

Sometimes I even get slight pain around the knee area, would you know the potential cause of this and a solution? I tend to feel it less so if I were to do them lying down but as soon as I progress onto the hanging variation I always feel it in my legs.

I am positive my form is correct and I try to minimize swinging and I am correctly bracing my core when attempting to do this exercise.

Thanks

Josh