Row a pyramid of hard strokes from one to 15 with three light strokes between each set. So one hard followed by three light. Then two hard followed by three light. Three hard, three light. 4/3. 5/3. 6/3 through to 15 hard, 3 light and then back down. 14/3. 13/3 and so on to 1/3.
PM3/PM4/PM5: Just start rowing or press A once