AIR300 Leg Extension

Keiser strength machines are primarily known for their dynamic capabilities and for being very joint-friendly - this makes them ideal for pro sports facilities (NFL, MLB, NHL, NBA) and physical rehab facilities (for mere mortals.) The Keiser AIR300 Leg Extension is a solid, quality, adjustable machine. Leg extensions that are unilateral-capable are less common and this design, in particular, reminds me of the Flex Fitness/StarTrac machines. The Keiser (model 1131) is truly a killer leg extension, as its ROM is just sick, so much so, that I highly recommend applying some amount of resistance to this machine BEFORE you sit down - more specifically, if its 2 leg rollers are freely 'dangling' (no resistance) and you get into position, and press the yellow [+] button (to add resistance) you may be unpleasantly surprised (or worse) when your legs are abruptly cranked underneath you! (if your name is GUMBY, you may disregard the aforementioned warning.) This machine also comes with an adjustable back pad - while the back pad's angle remains fixed, it can be moved forward or backward via a notched/ladder style system. All Keiser strength machines (with 2 or 5-window displays) will provide resistance & reps. On this machine, it is displaying the 'overall resistance' - you will need to divide the resistance (as shown on the display) by 2 to determine how much resistance is being provided for each leg (i.e. the max resistance for this machine is 278lbs (126kg), so that would be 139lbs max resistance available for each leg.) Weight can be adjusted in 1lb/1kg increments. As with most of my machines, I purchased this one used - it was part of a package deal for 3 Keiser machines from a bankrupt academy 15 minutes away. NOTE: Improvements were later made to the AIR300 Leg Extension (model 1131) design (i.e. its metal linkage was replaced with lighter weight kevlar) and it became what is now known as the A300 Leg Extension Pro (model 1133) and A400 Leg Extension Pro (model 1133).