A good analogy to fist chute development/modification is strength and muscle training at the gym. Enhanced and visible muscle development will not occur with a single workout, nor with workout once every other week. Workouts must be regular and consistent. Additionally, workouts that fail to integrate the entire body, mind, and lifestyle are typically ineffective. Depth fisting and deep hole development require commitment and regular practice.

The first method is based on landmarks or segments inside the fist chute. For example, one might say, “We fisted past the second ring” or “He was in the transverse colon.” This measurement strategy is problematic. Segments and landmarks can easily be misidentified and can lead to incorrect and potentially dangerous assumptions with future partners. A reckless or inexperienced top may push too deep or too hard based on a bottom’s inaccurate depth claim. This results in tearing in the upper fist chute.

The second method for measurement is based on the arm as the reference point. Without context, this can also be dangerous. For example, “He was mid-forearm” or “We fisted past the elbow” reveals nothing about the arm size of the top. The stature of both the bottom and top must also be revealed. For the top, this includes his height and arm size. Short tops with lean arms reach greater depth. For the bottom, this includes height. Tall bottoms have significantly more interior real estate than a short bottoms and can typically take an elbow or bicep easier.

To transform this measurement into an objective standard, measure the depth achieved on the arm with a ruler or tape measure. For the most accurate measurement, consider the position of the hand inside the chute. A hand with outstretched fingers can be over five centimeters (two inches) longer than a closed fist.

The term rectum originates from the Latin word, ‘recta’, meaning straight. Rectum is a misnomer. Early anatomists inaccurately compared human rectums to those of livestock and assumed a similar straightness. In standing, lying, and some sitting positions, the rectum is concave. It will straighten out while squatting or in certain sling positions. Additional features inside the rectum may create curves or an appearance of curvature. These are documented in the anatomy topics of this website.

The third characteristic common in depth chutes is responsitivity, or the ability to react to stimuli. In the case of fisting, responsivity is measured by how easily a hole expands, straightens, and resists the physiological processes that expel the contents out of the body. In lay terms, this is referred to as the greediness or the hungriness of a hole.

Certain types of touch, preparatory actions (such as douching), observing porn, or even simple thoughts about an upcoming session can result in a Pavlovian response in the fist chute. In these circumstances, the tissues of the chute begin relaxing and pulsating in preparation for depth play.

Tissue differences between the upper and lower fist chute make the upper fist chute more prone to injury.

The first hole and lower fist chute are very elastic with thick, dense tissue. The second hole and upper fist chute are less thick and have limited stretchcapacity. In some bottoms, the second hole feels like a cartilaginous ring (for reference, cartilage makes your ear and nose firm).

Injuries typically occur adjacent to the second hole but can occur at greater depths. Without gradual stretching from dozens of conditioning sessions, “pushing through” the hole is likely to cause harm. It can rip the ring or nearby tissue. For example, if an arm, toy, or even large cock is not aligned directly with the second hole, it can catch the side of the ring and stretch the rectum beyond its capacity, resulting in tears or full perforations that require surgical intervention and colostomy bags.

Apart from tissue differences, there are two additional reasons for pefroration injuries in the upper fist chute:

• the decreased diameter of the channel, and
• the stationary nature of segments in the upper fist chute.

When a firm object such as a toy, an arm, or a toy and arm coupled together exceeds the diameter of second hole or the stretch capacity of the sigmoid colon, extreme tension can cause a rupture. Likewise, in stationary segments of the fist chute (portions of the sigmoid and descending colons), there are only two things that can give: the intestinal wall or the firm object pressing against it. Since firm toys and arms will not bend, collapse, or break, a perforation in the fist chute will occur.

Another reason for injury is due to assumptions made by both participants of a fisting session. Three common assumptions that affect depth players, including very advanced players, include:

• Fist chutes in all depth bottoms are very similar to one another
• My partner has good depth fisting skills and extensive, robust depth experience
• During a session, my partner has the ability to tell if a hole is at risk for injury

Fist Chute Similarity

Tops and bottoms are guilty of assuming that depth holes are all alike. This assumption is dangerous because it creates a 'one size fits all' mentality. It fails to recognize that holes have different curvature and adhesion points that require different techniques to avoid injury.

During a session, a top should take the time to discuss what they are literally feeling inside the hole while at extreme depths. Bottoms can validate or redirect the top as progression continues.

Partner Skill Levels

During initial encounters, fisters tend to overestimate the skill and experience level of their partner.

This provides a false of security. A partner's previous depth experiences may not be relevant to the session and hole.

The assumption can impede critical communication at extreme depth.

Sensory Capacity

Sensations that a bottom experiences inside his fist chute are limited. For example, it is hard for a bottom to gauge depth when visual perception is limited and the tissue around the anus is numb.

Inexperienced tops assume that a bottom knows if something isn't right inside his hole. Bottoms assume that tops can feel and interpret if something feels out of the ordinary.

During the heat of the moment, it is easy to forget limited sensory capacity. Implementing regular pauses to check in on one another is the best way to prevent injuries.

• Sharper, unmanicured nails
• Kitchen utinsels used to extract stuck toys
• Long, rigid toys, such as the Dick Rambone dildo
• Lube injection equipment with sharp, pointed edges
• Narrow enema nozzles
• Booty bumps that deteriorate tissue
• High velocity water from shower shots
• Simultaneous use of more than one toy
• Arms and toys coupled together at the same time

Performance anxiety affects all fisters but is exacerbated for depth bottoms and tops. This is to say that a depth bottom or a depth top is likely to push themselves above safe limits when playing with others, especially those with depth skills in order to prove their abilities.

Performance anxiety also occurs in large groups with onlookers who are curious to see extreme depths.

Finally, performance anxiety occurs when there is extreme sexual attraction, and one partner wants to deeply impress the other. All three of these situations hamper communication and increase risky behaviors.

There are three types of accidents due to lubrication errors: perforations due to insufficient lube, perforations due to overconfidence in lubrication, and perforations due to internal lubrication application.

The first is self-explanatory. Without sufficient lube, a hand or toy is likely to catch on a segment of tissue. Instead of sliding past it, it pushes through the tissue causing perforation.

The second type of accident is a little more nuanced. It is not uncommon for novice and intermediate depth bottoms to believe that 'more lube is the answer to greater depth.' It is not. The limiting factors for depth are insufficient stretching over multiple sessions and stationary segments of the fist chute. Overlubricating and then pushing through under the expectation that the colon will expand or move instead of tear is foolish. Lube should not be the source of false confidence.

The third accident involves devices and contraptions made to deliver lube deeper into the hole. Firm objects with small circumferences should always be used with care and should never be used when the hand is already inside the hole.

The primary reason for impaired judgement is the coupling of alcohol or other chems while fisting. Those who use should be aware of how their bodies react to specific drugs and should consider additional safeguards to prevent overzealous play that may result in perforation.

Examples of overzealous play include: limit-pushing, rapid pistoning with arms or toys, and weaking the fist chute lining with booty bumps.