I recommend that you also look at squats and other bilateral versions of leg strength such as the foundations found in bridge and goddess
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Using chair pose as a preparation we will look to evolve a bi-lateral exercise where both sides of the body are being utilized symmetrically into the uni-lateral version we find in a high lunge
Version 1. ( at .29 seconds into video) High lunge:
Look to hold for a set number of slow breaths as in Ashtanga Yoga (5 breaths)
or
look reference a clock/watch/phone for a 15 second hold
(either of these methods can be increased after several weeks of practice in 5 breath/15 second increments)
Version 2. (2 mins into video) High-low lunge transition
Set a number of 5x transitions from high-low lunge to begin
When you have mastered 5 repetitions of high - low lunge for 5 separate sets, consider progressing to more challenging variations where the supporting leg is taken away
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