Online fitness instructors offer a modification for every move — knees down, weights off, your own pace — so nobody is left behind.
Take them at their word. When the class calls for a plank with a knee driven to the opposite elbow, modify: lower the knees, then the arms, then the laptop lid, then walk to the kitchen and modify further into pancakes. Field notes: heart rate held in the fat-burning zone throughout the syrup. The instructor, still counting in the dark, logs one attendee down and thanks everyone for coming.