If you need something done, give it to a busy person. If you are time-crunched for a race preparation, you can do twice-a-day sessions. The current ‘haze’ condition and bad air quality has led to jettisoned sessions, or indoor-sessions. Nevertheless, with creative scheduling and workout design you can still save your race (and race fitness).
Upside: You can split a long run into two shorter sessions. For instance, a 21km run can be split into 10km and 11km sessions. I have done two hours of indoor-cycling on the turbo-trainer in the morning, followed with an evening o1-hour session. My legs, generally, feel fresher and I can opt for similar intensity, or higher. It is now wonder that elite swimmers train twice a day, 4-5 days per week. When I was training for my Boston Qualifiers (BQ), I sometimes did two sessions per day as my additional session in the ‘Run Less, Run Faster’ approach. I never exceeded four sessions of running, all done at tempo-paced. A second session may be shorter, and focused on slopes or off-road surface.
You can also integrate short (15-20 minutes) strength and core stability sessions. These sessions will shift focus onto rehabilitative interventions, muscle-rebalances, and developing functional strength. I end each aerobic session with balance-work (proprioceptive), kettle-bell training, and free-hand/bodyweight exercises.
Down side: You will have to wash another set of exercise attire. Also, be mindful of your energy levels. If need be, fuel up about 15-20 minutes before a session with Hammer Nutrition Perpeteum or Hammer Gel. I use a 645-ml serving bottle (26 servings). Hydrate throughout the day. I use ginger-tea to reduce post-exercise swelling and inflammation.
Leadership Lessons: Prioritise. Make important things important. Shift your focus to relevance and the necessary. However, chores still need to be done.