This shocker will consist of 1 exercise: squats
When doing the reps bang out ten reps, wait for about 10-15 seconds (with weight still on back) repeat until reps are met. Rest for 1-2 minutes. It may seem grueling but the people I have recommended it to did gain 1/2 inch to thighs from that day.
It will take 2-4 days to recover. Perform this only 2-3 times a year.
No pain, No gain