Rebuild the left leg

A 4-week, 10–13 minute daily routine to bring back quad strength after a lower-back nerve irritation, and get you jogging again.

Teal is your left leg in every drawing.

Before you start

A back tweak followed by hip pain, quad spasm and weakness fits irritation of a nerve root around L3/L4, which supplies the quads. Pain settling while weakness lingers is common: the nerve recovers slowly, the muscle has shrunk from 10 weeks of less use, and your brain has learned to protect that leg. This programme works on all three.

Get a recheck with your GP or physio if

  • Strength hasn't measurably improved by the end of Week 2
  • The knee buckles on stairs or kerbs
  • Numbness or tingling in the thigh or shin is spreading
  • Weakness appears in the other leg or the foot

Go to an emergency department now if

  • You have numbness in the groin or saddle area
  • Bladder or bowel control changes
  • Weakness gets rapidly worse

How to use it

Once a dayDo the main routine for the current week.
Top-up, up to 2 more times10 quad sets, 1 wall sit, 10 sit-to-stands. About 4 minutes.
EffortEnd each set able to do 2–3 more good reps. Easy two days running? Add reps, slow down, or add a backpack.
Symptom ruleUp to 3/10 discomfort is fine if it settles within 24 hours. Worse next morning? Go back a week for 2–3 days.
Left vs rightTrain both legs on single-leg work. Start with the left and give it one extra set.
KitChair, wall, step or stair, rolled towel, backpack. A long resistance band is optional.

The programme

Walk–jog plan

Start when you can brisk-walk 30 minutes and do 10 single-leg box squats on the left without symptoms, usually during Week 3 or 4. Run on soft, flat ground, never on back-to-back days, at a conversational pace. Slightly shorter, quicker steps than usual (about 5–10% more per minute) reduce the load on each landing.

StageSessionRepeatsMove on when
11 min jog, 2 min walk62 sessions with no symptoms next day
22 min jog, 1 min walk62 sessions with no symptoms next day
34 min jog, 1 min walk42 sessions with no symptoms next day
410 min continuous easy jog1Add 5 min per session, no more than 10% a week

On the plane

Long sitting stiffens a recovering back, switches off a weak quad and raises blood-clot risk. Book an aisle seat, wear knee-length compression socks, drink water steadily, and put a rolled jumper behind your lower back. On travel days these sets plus one Top-up replace the main routine.

Seated set, every waking hour (3 min)

  1. Ankle pumps, 20. Point and flex both feet briskly.
  2. Seated quad lock, 10 × 10 s (left). Straighten the knee as far as the seat in front allows and lock the thigh hard.
  3. Seated march, 10 each. Lift a knee 5–10 cm, hold 2 s.
  4. Glute squeezes, 10 × 5 s.
  5. Pelvic tilts, 10. Gently arch then slump the lower back.
Watch demos

Standing set, every 2–3 hours (4 min)

  1. Calf raises. 20 on both legs, then 10 on the left only.
  2. Mini squats, 15. Quarter depth, weight shifted to the left.
  3. Standing quad stretch, 30 s each. Knees together, tailbone tucked.
  4. Staggered-stance hip flexor stretch, 30 s each.
  5. Standing back extensions, 10. Hands on hips, lean gently back.
Watch demos

Progress tests

Test both legs at the start of each week, before the routine. By Week 4, aim for the left within 10% of the right. If the left hasn't improved between Week 1 and Week 3, book a recheck rather than pushing on. Entries save in this browser only.

WeekL sit-to-stand (reps)R sit-to-stand (reps)L wall sit (s)R wall sit (s)L thigh (cm)R thigh (cm)Notes