Quads & Hip Flexors
A1: Quads on wall - passive & isometric
1 x 60s passive, iso ramping into 10s pushing 30s passive (each side)
Use something soft for your knee, the closer it is to the wall the more intense the stretch. Try to tuck the hips (posterior pelvic tilt) to increase the stretch through the quads. Hold for 30-60s then perform an isometric pushing the foot into the wall. The idea is to engage and use the muscles that you felt were stretching. Hold the isometric for 10s then relax and try to drop deeper into the stretch.
B1: Hip flexors PAILs - find it passive, twist, isometric
1 x 60s passive, iso ramping into 10s pushing 30s passive (each side)
Hit the deep hip capsule of the front leg and then the hip flexor of the back leg. Try to keep the front knee at 90 degrees to maximise the stretch sensation. If too challenging you can incline the bench so the knee is higher than the lead foot.
Hamstrings
D1: Hamstrings Passive & Isometric - bent leg, find it, work it with bent knee
1-2 x 60s passive, iso ramping into 10s pushing 30s passive (each side)
Go hunting for a deep stretch in the body of the hamstring - the higher up the better. If you feel it in behind the knee bend the knee a little bit more. Try to hinge at the hips, arch the lower back and avoid rounding over.