Chest to floor press-ups, with a weighted pack on, total extra weight 5 kgs, 8 sets to failure, 4 minutes = set + rest: 16 - 11 - 10 - 9 - 10 - 9 - 9 - 9. Total = 83

Getting closer to the "ideal" 8-12 reps - not sure if my pack will tolerate much more weight.