Sylvia Kampshoff worked long hours as a finance lawyer when she moved to Houston in 2015, sometimes going into the office at 4 a.m. and leaving the next day at 3 a.m. Her workouts were limited to days ...

Every personal trainer has a handful of gold-star clients who manage to power through every move and lift, without breaking much of a sweat. Take my 55-year-old cousin Sophie, whom I saw for a quick ...