Sometimes you float through your training runs like a butterfly, while other times every step stings like a bee. But since you're no Muhammad Alisorry, you're a midpack dude prepping for a charity marathonyou'll like this smooth-riding, ultra-comfy trainer. On both good and bad days, testers found the new version of the Supernova Cushion, which has been revamped with a mechanical, decoupled heel device, to have energetic bounce. Plus, when we started bonking, it kept us on our toes, literally: The dual-density forefoot cushioning encourages an efficient, upright form. 11.8 oz; adidas.comBonus: The sock liner is made from moisture-wicking, antimicrobial material.Bummer: The blown-rubber outsole showed signs of wear after 50 miles.