With Olander’s Nike credentials, it’s no surprise that aesthetics and comfort are central — “obviously performance and innovation is really, really important,” he says, “but if it doesn’t look good, and feel comfortable, people aren’t going to use it.” Mullins cites heightened “proprioceptive feedback” —awareness of our balance, posture and coordination. “A walk with a vest on feels like training rather than a walk. For a lot of people that’s the difference between doing it and not doing it, and consistency beats optimisation every time,” he says.