You can measure you extension yourself using this technique You can assess you own extension though. It's quite easy: 1. put your leg on a bench, seat, bed, floor or anything similar but preferably something fairly firm. 2. with not too much pressure, press the back of your knee down - use your leg muscles, not your hand! 3. slide your hand, palm down, under the back of your knee a) if you can get your entire hand under easily, it's probably about +10 degrees b) if you can get just your fingers under, it's about +5 c) if you can get your fingers under but it's a push, it's +0 d) if you can't get your fingers under at all, it's -5 or more Here's a graphic to explain the degrees involved And I can measure your flexion if you want me to. Just get someone to take a photo of your leg in one of these poses - and note the shorts and bare feet!