Stolen from: https://mensfitness.co.uk/workouts/try-this-dumbbell-only-leg-workout/
Leg Workout

1. Bulgarian Split Squat
Weight: Reps: 10 each side Sets: 3 Rest: 60 secs
- Rest the instep of your back foot on a chair and plant your front foot so it’s facing forwards.
- Your hips should be facing forwards and your torso should be upright with your core braced.
- Keeping your torso upright, lower until your front thigh is parallel to the floor.
- Keep your front knee in line with your foot but make sure it doesn’t travel beyond your toes.

2. Side Lunge
Weight: Reps: 10 each side Sets: 3 Rest: 60 secs
- Stand with your feet close together and facing forward, your torso upright and dumbbells by your sides.
- Take a big step to the side, lowering onto your leading leg.
- As you bend your leading knee, lower the dumb-bells until they touch either side of your foot.

3. Sumo Squat
Weight: Reps: 12-15 Sets: 3 Rest: 60 secs
- Take a wide stance with your toes pointing out slightly.
- Grip a dumbbell with both hands and lower until your thighs are parallel to the floor.
- Keep your knees in line with your toes and your back upright.

4. Reverse Lunge
Weight: Reps: 10 each side Sets: 3 Rest: 60 secs
- Stand with your feet slightly apart, your back upright and the dumbbells by your sides.
- Step back into a lunge, bending your back leg so that your back knee nearly touches the floor.
- Keep your torso upright throughout the move and make sure your front knee is over your front toe.
- Push off the back foot to return to the start.

5. Side Step-Up
Weight: Reps: 10 each side Sets: 3 Rest: 60 secs
- Try to find a chair or box that is no higher than knee height and place one foot flat on the top with your other foot to the side.
- Keep your back upright and hold the dumbbells by your sides.
- Push up with your leading leg while keeping your back upright.
- Step back down to the side with your trailing leg and repeat as before for all your reps before swapping sides.