What training jammer? Many (Masters)swimmer also wears these to the competition. You won't meet a triathlete without a Funky Trunks jammer. So make sure you always have a pair or so that fits the mood, the locations and goals of that moment. So you are not left with only one jammer, it will last you for years, so you might as well buy a few.
Some call it a speedo, but it really is a funky trunk. You can't find them smaller and more dressy. Hunks who dare, switch to the letter. Great for swimming and being seen. Yes that again.