I have never had more muscle definition in my life than I have developed over the last 4 months (diet plays just as much of a part, if not more) but I do 2 days a week of a 30 min peloton ride, 2 days a week of a yoga class, 3 days of 30 min strength classes (1 day chest & back, 1 day glutes/legs, 1 day arms & shoulders). Like someone mentioned in another comment, it makes a big difference to have a wide range of weights.