Answer:
Sunday -- to kick off the week, aim for 45 minutes instead of 30, or opt for a brief 15-20 minutes of intense activity.
Monday -- maintain all workouts but incorporate weights to accelerate muscle growth.
Tuesday -- consider extending to 40 minutes or stick with 30 and include an uphill component.
Wednesday -- rest days are beneficial; allow your muscles ample time to recuperate.
Thursday -- a 20-minute jog works well as a warm-up; challenge yourself by doubling the reps in each exercise: instead of 20 push-ups, do 40; instead of 10 squats, do 20; and instead of 25 curl-ups, do 50.
Friday -- a 30-minute biking session is effective; give it your all in sprints to wrap up the week on a high note.
Saturday -- an hour-long walk is advisable, but try to increase the frequency.
Add weights to every workout.
Though I can't credit the original author, they know it's their idea. Hopefully, this is useful!