But he believes the extra energy expenditure is largely related to the heavier weight of the shoe. MBTs weigh slightly more than two pounds each.
不过他也认为，多余的能量消耗很大程度上同鞋子重量有关。一只MBT鞋的重量是两磅多一点点。
3
Outside her office in Boston this week, Carin Willis was wearing her MBTs, which have big, thick, curved soles that look like big rubber rockers. "They're very heavy.