Cessna manuals only specify short field technique for the performance. You will find further description in the normal procedures checklist and in the associated take-off amplified procedures (Section 4). I will check the 172R specifically but all others from memory specify 0-10 degrees for take-off. The amplified procedures specify a 10% reduction in distance to 50' with flap and the correct speeds.
The short field distance is best case scenario. If you have more distance available, you will be able to get out legally.
Don't forget your 15% allowance over the factory figures as per the CAOs.