Sportsbox Numbers & Tracker Definitions
“Numbers” are found on the top right corner of the 3D Analysis Screen of the Sportsbox Golf app. Tap on the 2nd icon from the left to access the numbers tab that appears on the bottom of the screen, showing and measuring various aspects throughout the golf swing.
Learn how to change your trackers. Click here.
Under the Numbers tab, you will find a list of “Trackers” and "Indicators" that you may select.
A Tracker is a biomechanical measurement -- a measurement of motion without regard to forces (position, speed, angle, etc.) of a joint, body segment, club, or ball throughout the swing — you may be familiar with the term “Kinematic Parameter.” It can be graphed as a single line in a parameter vs. time graph.
- Examples: Chest turn, pelvis sway, hand speed
- Examples: Chest turn at the top, max pelvis sway in backswing, max hand speed in downswing
CURRENT SPORTSBOX 3DGOLF NUMBERS TRACKERS and INDICATORS AS OF APRIL 2023 (PRO PLANS):
- To populate speed indicators and trackers, swings MUST BE RECORDED IN-APP; imported swing videos will not work (nor will previously imported videos).
- Make sure the recording is in a space with good lighting (preferably outdoors, not backlit) – won’t generate accurate numbers if you’re in a dark indoor space or too bright outdoors and have to use the “Custom Lighting Mode” feature to record.
View this tutorial on our new number tiles:
TRACKER DEFINITIONS
TURN: Turn is rotation around the up-down axis, i.e. the Y-Axis. A positive value means that your body is turning (opening) towards the target and a negative value means your body is turning (closing) away from the target. All turn values are calculated with respect to the straight line through the two ankles as the 0 degree line.
- Chest turn
- Pelvis turn
BEND: Bend - or Forward Bend - is rotation around the side-to-side axis, i.e. the X-Axis. A
positive value means that the segment is bending forward. If the segment was your chest, then your chest would be going towards the ground. A negative value means that the segment is bending backwards.
- Chest bend
![side bend](https://help.sportsbox.ai/hs-fs/hubfs/side%20bend.png?width=400&height=460&name=side%20bend.png)
SIDE BEND: Side bend is rotation around the front-to-back axis, i.e. the Z-Axis. A positive value means the trail side is dipping lower than the lead side; negative side bend means the trail side is getting higher than the lead side
- Chest side bend
- Pelvis side bend
SWAY: Sway values are measured in inches. Sway shows the side-to-side path of movement. Toward the target is a positive value and away from the target is a negative value. Sway value is always 0" at address.
- Chest sway
- Pelvis sway
- Mid hands sway
- Forehead sway
- Lead/trail knee sway
Lift: Lift values are measured in inches. Lift shows the up-and-down path of movement. Negative value is a "drop" toward the ground - relative to the position of the point at address, and positive value is a lift up away from the ground. Lift value is always 0" at address.
- Chest lift: Measuring the up-and-down movement of the center of the chest segment
- Pelvis lift: Measuring the up-and-down movement of the center of the pelvis segment
- Mid hands lift: Measuring the up-and-down movement of the center of the two hands
- Forehead lift: Measuring the up-and-down movement of the center of the forehead.
It is affected mostly by the lifting and dropping of the head but can be affected by looking up or down.
- Lead/trail knee lift: Measuring the up-and-down movement of the center of the trail or lead knee
Mid-Hand Speed: The linear velocity of the hands moving through the swing, measured in miles per hour. The hands reach their maximum speed before impact. This happens because the forces and torques created on the arms during wrist release in the downswing create an opposite force that slows the hands down. This Max Hand Speed value is an indicator that is available in the "Numbers" tab.
Trail/Lead Knee Flexion:
This number denotes the angle of the knees as they bend and straighten throughout the swing. A perfectly straightened leg should have a 180 degree flexion value and as the knee bends, that number will decrease.
Mid-Hands Speed: The resultant speed of a point on the club shaft that is mid-way between both hands as they grip the club, in miles per hour. It is interesting that the hands reach their maximum speed before impact. This happens because the forces and torques created on the arms during wrist release in the downswing create an opposite force that slows the hands down. This Max Hand Speed value is an indicator that is available in the Watchlist. *This tracker is currently only available for videos RECORDED in the app, NOT FOR IMPORTED VIDEOS - as of Nov 2022.
Tempo: This is an indicator that is shown on the 3D avatar screen. It is the ratio of the backswing time to the downswing time and for a driver, it is typically around 3 to 1. A good tempo helps create a powerful transition from backswing to downswing.
Sway Gap: The sway differential between the chest and pelvis segment. A negative number indicates the chest is further away from the targer compared to the pelvis. A positive number indicates the chest is closer to the target compared to the pelvis.
INDICATOR DEFINITIONS
Clubhead speed max: The maximum speed of the club head in the downswing, usually at impact. (Pro-Driver: men's avg.= 110mph, women's avg.= 95mph)
Release factor: The ratio of the max club head speed to the max hand speed. (Pro-Driver: men's avg.= 5.0, women's avg.= 4.8). **This is like Sportsbox’s equivalent to the Smash Factor**
Core speed gain factor: The ratio of the max chest turn speed to the max pelvis turn speed. (Pro-Driver: men's avg.= 1.5, women's avg.= 1.4)
Shoulder speed gain factor: The ratio of the max lead arm swing speed to the max chest turn speed. (Pro-Driver: men's avg.= 1.4, women's avg.= 1.3)
Wrist speed gain factor: The ratio of the max shaft swing speed to the max lead arm swing speed. (Pro-Driver: men's avg.= 2.3, women's avg.= 2.0)
Shaft swing speed max: The maximum shaft swing speed in the downswing. (Pro-Driver: men's avg.= 2,277d/s, women's avg.= 1,903d/s)
Lead upper arm swing speed max: The maximum lead upper arm swing speed in the downswing. (Pro-Driver: men's avg.= 1,005d/s, women's avg.= 960d/s)
Chest turn speed max: The maximum chest turn speed in the downswing. (Pro-Driver: men's avg.= 725d/s, women's avg.= 716d/s)
Pelvis turn speed max: The maximum pelvis turn speed in the downswing. (Pro-Driver: men's avg.= 484d/s, women's avg.= 510d/s)
Hand Speed Max: The maximum hand speed in the downswing.
Hand speed max timing: The time from the maximum hand speed in the downswing to impact. (Pro Driver: men's avg = 69m/s; Pro Driver: women's avg = 93ms)
Backswing time: The time it takes to swing the golf club from address to top of backswing. (Pro-Driver: men's avg.= 0.82s, women's avg.= 0.96s)
Downswing time: The time it takes to swing the golf club from top of backswing to impact. (Pro-Driver: men's avg.= 0.26s, women's avg.= 0.29s)
Lead Wrist Angle at Arm Parallel: Lead wrist angle when the lead arm is horizontal in downswing.
Shaft Angle Face-On at Arm Parallel: Shaft face-on angle when the lead arm is horizontal in downswing.
Sway Gap at Address: The difference between the pelvis sway and chest sway at address
Sway Gap at Top of Backswing: The difference between the pelvis sway and chest sway at top of backswing.
Sway Gap at Impact: The difference between the pelvis sway and chest sway at impact.