A lot of people have muscles that are tighter in some areas more than others.  Muscles also have connective tissue surrounding it.  These tissues can get bound up or twisted.  To help the body restore proper function foam roll is a great way to get those tissues functioning properly.  

Kettlebells work the body in a way the posterior chain (backside of the body) can work effectively.  True health is looked at by the posterior side of the body and not how ripped your abs are or how big your biceps are. 

These mini bands can aid in neurological hip activitation.  That sounds fancy by really the foundation of true joint mobility and stability starts with the hips.