To progress and improve your fitness throughout the years, you need to change your routine up every few months to keep your system stimulated. Here are some suggestions on Progression:

Learn each exercise to perfection. Continue to work on your form.
To get stronger: increase the resistance and add heavier weights.
Increase the amount of repetitions you do for each exercise.
Increase the amount of time you exercise.
Add speed to your exercise.
Increase the amount of days you exercise.
Reduce stability to train your balance by doing exercises on one leg.
Having good leg strength carries over to a lot of aspects of the game of golf including helping you shift your weight, gaining more power and endurance to walk 18 holes without getting tired.

The toe tap exercise helps develop strength and flexibility in the lower body to shift weight more efficiently and gain more power.

Stand in a lunge position using a golf club as balance. Keeping your spine straight and your abs engaged, move one leg forward, tap your foot on the floor, then swing it around diagonally behind you and tap it on the floor.
Alternating taping your foot front to back.
Keep your supporting leg flexed.
Repeat on the opposite leg.
Do 8 to 10 repetitions on both legs.