Plum to Knee Series: A Complete Guide
Quick Intro
Plum to Knee Series is a Martial Arts Drills exercise performed by securing the Thai plum clinch and immediately chaining a rapid series of alternating knee strikes without pausing, maintaining constant downward head control throughout the sequence. Never letting the grip loosen between knees, so the pull and the drive stay connected on every rep, is what keeps this series from giving a partner room to post and escape.
Equipment Needed
The drill needs a partner able to work the clinch safely, with the knees thrown light or into a held pad or body protector.
Why It Matters
The grip has to hold under sustained output while the legs drive one knee strike after another without a break. A muscle at the front of the hip (hip flexors, iliopsoas) drives the knee strikes, and the abdominal muscles running down the front of the stomach (rectus abdominis) brace the trunk through the series. The largest glute muscle (gluteus maximus) and the front of the thigh (quadriceps, rectus femoris) power the striking leg, and the front of the shoulder cap (deltoid, anterior) holds the clinch. The muscles along the sides of the abdomen (obliques) support the rotation behind each knee, a muscle across the upper back and neck (trapezius) maintains the grip and the lower back muscles (erector spinae) brace the spine through the sequence.
When to Do It
Plum to Knee Series works well within a clinch-focused session, added once the plum grip already feels secure and controlled. Two to three sessions a week is a reasonable pace, always with a partner comfortable absorbing repeated knee strikes.
Anyone with a current hip, knee or shoulder issue should get individual guidance before adding this drill, since the repeated striking and the sustained grip both load those areas directly.
Getting Ready
Securing the clinch and throwing a single knee strike checks the grip and the drive this series depends on. A couple of slower, two-knee combinations preview the full rapid series before a complete set is attempted.
Step-by-Step Instructions
- Secure the clinch. Lace the grip and pull the elbows in tight.
- Throw the first knee. Drive one knee up without releasing the grip.
- Alternate immediately. Chain the opposite knee strike without pausing.
- Maintain control. Keep downward head control through the entire series.
How Many, How Often
Plum to Knee Series is dosed by reps, with each full series of alternating knees counting as one set.
| Level | Where you’re at | What to do |
|---|---|---|
| Beginner | New to chaining knee strikes without the grip loosening | 3 sets of 4 to 6 total knees |
| Intermediate | The grip holds steady through a longer series | 3 to 4 sets of 6 to 10 total knees |
| Advanced | Comfortable sustaining a rapid series at full output | 4 sets of 10 to 14 total knees |
Keeping the grip connected between every knee matters more here than how hard any single strike lands, since a loosened grip lets a partner post and escape however much power went into the last knee.
Modifications and Variations
As an easier version, Thai Clinch — Plum Control secures and holds the same clinch and posture break without chaining any knee strikes. Static Plum Grip practices the grip alone.
Common Mistakes to Avoid
Loosening the grip between knees. Letting the laced hands relax even briefly between strikes gives a partner the window needed to post and create space. The grip stays locked through the whole series.
Pausing to reset between strikes. Treating each knee as its own separate action, with a pause in between, defeats the point of a rapid, chained series. The strikes flow one into the next without a gap.
Losing head control as fatigue builds. Letting the downward pull ease off late in the series, once the legs start to tire, gives the partner’s posture room to recover. The head control stays as firm on the last knee as the first.
After Your Set
Rolling the shoulders slowly through a few full circles unwinds them once the series finally ends. The forearms benefit from a slow wrist roll through their complete range as well, after gripping through every rep.
Going Deeper
A grip that holds under repeated knee strikes is what separates a usable clinch from one that only works for a single strike. The grip tends to loosen as the legs fatigue late in a long series. Shortening the series and rebuilding grip endurance before chasing more knees fixes this faster than repeating a long series where the grip keeps failing near the end.
Someone new to this series generally manages a short, controlled chain of two or three knees within the first few sessions, then works toward a longer, sustained series over the following couple of weeks.
How to Know You’re Improving
- A grip that stays locked for the length of the series
- Knees that chain together without a pause between them
- Head control that holds as firm at the end as the start
- A series that holds up as the legs begin to fatigue
A locked grip between knees matters more than how many knees land.
Muscles Worked
- Iliopsoas (the hip flexor group at the front of the hip, firing the first knee before the grip has even settled)
- Rectus Abdominis (the abdominal muscles running down the front of the stomach, holding the trunk folded from the moment the clinch lands)
- Gluteus Maximus (the largest glute muscle, extending the standing hip on every strike of the chain)
- Anterior Deltoid (the front of the shoulder cap, keeping the arms wrapped while the legs work)
- Rectus Femoris (a front thigh muscle that crosses both the hip and knee, taking the body’s weight with no pause between knees)
- Obliques (the muscles along the sides of the waist, swapping the hips over as the strikes alternate)
- Trapezius (the broad muscle spanning the upper back and neck, holding the head down for the length of the chain)
- Erector Spinae (the muscles running along the length of the spine, holding posture from the clinch through to the last knee)
FAQ
Why does the grip matter more than the power of each knee? A single powerful knee thrown from a loosened grip still lets the partner post and create space right afterward, while a grip that holds through the whole series keeps the pressure on for each strike that follows.
Is this harder than holding the clinch without striking? Yes, maintaining the grip while the legs chain together a rapid series of knees asks for more sustained output than holding a static posture break.
Is some hip or shoulder fatigue after this drill normal? Yes, a worked feeling through the hips and the shoulders after a full series is expected. Hip or shoulder pain that doesn’t settle down by the next day is worth a visit to a doctor or physical therapist.
Does the plum control come before the knee series? Yes, Thai Clinch — Plum Control builds the laced grip and the posture break, which are worth having solid before a rapid series of knees is added.
How often should the knee series be trained? Two to three times a week, with a partner comfortable absorbing repeated knee strikes, suits most people building toward this skill.
Related to Thai Clinch — Plum Control as the easier version holding the clinch without knee strikes.