Trendy Athletic Shoes: A Trend That Won't Go Away. Some trends come and go while others never seem to leave us. One such trend is the sporty-casual athleisure style which always seems to appear in some form or another, whether it be on a runway or walking down the street. Trainers are at its core with this trend because they can make anything look casual—from dresses to suits! When you think of trainers one thing that typically comes to mind would be sustainability and recent studies have shown just how important this topic really is for Millennials and Generation Z....