I always suggest getting a blue one first to ease you in!
Self-Myofascial release (yep i’m a geek!) isn’t always effective with everyone and too much pain/discomfort will limit the benefits also. Easy rule of thumb is to match the density of the roller with the density of the athlete. If you’re super muscle and no fat (aren’t we all on STW though!!) i.e. high density muscle then go for the nobbly black rollers, if you’re like the rest of us ( :roll:) and a little more insulated for winter then blue is a bit softer.
The aldi one looks pretty good as a starter and really cost effective way of testing it out.
I wrote a free info sheet for my athletes which you’re welcome to download. (Mods it’s all freebie and i’m not touting for business, hope that’s OK).
Clicky Foam Roller Freebie