Flexa

Stretching apps give you a timer and a picture. Flexa gives you a number. Hold still at the end of a movement and the watch reads gravity to work out the angle, so "my hamstrings feel tight" becomes 61 degrees, and next week you can tell whether that was true.

Because it measures, it can also suggest. From the pairs of hold time and gain it collects, Flexa fits how much your tolerance actually moves per second held, and sets the duration of the next stretch from that instead of defaulting to thirty seconds for everything.

WHAT IT DOES

• Ten tests: shoulder flexion and abduction, hip flexion, straight-leg raise, ankle dorsiflexion, neck rotation and side bend, trunk rotation, wrist extension, calf
• Left and right separately, with the asymmetry in percent
• A stillness gate, so it measures your range and not your swing
• Age-group norms, so the number means something
• A guided stretch with haptic start and stop, and a hold time that follows what the last session gained
• A trend per test, and a summary that names your weakest link
• Five languages and a glance

WHAT IT NEEDS

• Everything is worked out on the watch: no phone, no account, no internet
• Flexa measures and compares against age groups. It is not a diagnosis and does not replace a physiotherapist