The dress code of the clientele in Planet Organic, Notting Hill is gym chic. On a hot day in mid-August, the men wore mid-thigh shorts, pectoral-enhancing vests, neon Nikes; the women were in black leggings and intricate ensembles of sports bras and cross-strapped Lycra. They had all either just worked out, were about to work out, or wanted to look as if working out was a constant possibility.