Climbing is the practice of using one’s hands, feet, and possibly other equipment to ascend a steep object. Climbing is an activity done for recreational or competitive purposes, like rock climbing, but can also be done simply out of necessity or as a professional trade, such as when one climbs industrial objects to make repairs. Some species are well adapted to climbing, such as monkeys and cats, with certain physical characteristics that have evolved to help them climb, such as claws and tails. Because humans were not evolved to climb in the same way, training and practice is oftentimes required before attempting a more challenging trek.
Clothing when rock climbing should be comfortable, non-restrictive, and appropriate for the climbing environment. Indoor rock climbing clothing should be comfortable with the ability for unrestricted movement; loose fitting items are the most comfortable. Clothing for outdoor rock climbing depends more heavily on the conditions or weather. Staying warm without overheating is important, so layers are suggested.
If knee pain occurs when climbing stairs, it can be a symptom for chondromalacia. This is when the cartilage under the knee cap begins to soften and wear away. As the cartilage cushions the moving parts of the knee from being worn away by friction, chondromalacia makes the knee lose a part of the protection.
In free climbing, the climber may use equipment like climbing protection and ropes as a means of protection for injury during falls, but not for the purpose of assisting progress. Free climbing includes traditional climbing, sport climbing, bouldering, and solo climbing.