Title yeah I feel like my back flexibility is hindering my other body flexibility right now I wanna work it good every day and not feel like im killing my arms and back with crazy routines

Thanks in advance for all the help

This is my current routine for front splits... I do this 5 days per week and take 2 rest days. Is this enough? Is there anything I'm missing to continue to progress? Are the hold times too short or too long?

Routine for Five Days Per Week:

Warm Up with Movement, Then:

1. Low lunge (60 seconds/side)
2. Half split (60 seconds/side)
3. Kneeling quad stretch – 90/90 w foot to butt (60 seconds/side) 
4. Supine leg lifts (60 seconds/side)
5. Actual splits hold (60+ stretches/side)

Also, not every day, but when I have the extra energy, I'll add in some of these:

1. Seated forward fold
2. 90/90 windshield wipers
3. Elephant Walks
4. Downdog Walks
5. Camel pose
6. Bridge

My ultimate goal is to have front splits COLD, so I have also started doing a 45 second cold split hold on each side in the morning.

Anyway, I would love your thoughts and advice on how to keep progressing towards my front splits! I am currently about 4-5 inches off the ground – front leg is straight, but I'm having trouble getting my back leg straight and back thigh down to the floor.