Question: Are bodyweight categories similar or different for the genders?
About the article "Olympic weightlifting", section "Abstract".

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The main function of the Wilks formula is in weightlifting involved in Powerlifting contests.
It is used to identify the best lifters across the different bodyweight categories and can also be used to compare men and women lifters as there are formulas for both genders.
First, second and third places on the winner’s podium within their own age, bodyweight and gender classes are awarded to the competitors who lift the most weight respectively.
Where two lifters in a class achieve the same combined total lifted weight the lighter lifter is determined the winner.
The Wilks formula comes into play when comparing and determining overall champions across the different categories.
The formula can also be used in team and handicap competitions where the team includes lifters of significantly varying bodyweights.
The Wilks formula like its predecessors, the O'Carroll and Schwartz formulas, were set up to address the imbalances whereby lighter lifters tend to have a greater power-to-weight ratio ... lighter lifters tending to lift more weight in relation to their own bodyweight.
This occurs for a number of reasons relating to simple physics, the nature of the makeup and limitations of the human skeletal and muscular system and, the shorter leverages of smaller people.
This phenomenon can be seen by looking at the current men's senior world powerlifting records.
http://www.powerlifting-ipf.com/Records.44.0.html Note the totals section and that lighter lifters below 100 kg bodyweight achieve totals in excess of ten times bodyweight whereas heavier lifters do not.
The Wilks system is primarily a handicapping process that provides an adjusted statistical method to compare all lifters of varying classes and groups on an equal standing and makes allowances for the disparities.
Wilks charts and a calculator are freely available on the website of the International Powerlifting Federation (IPF).
http://www.powerlifting-ipf.com/Downloads.55.0.htmlAccording to this setup, a male athlete weighing 320 pounds and lifting a total of 1400 pounds would have a normalized lift weight of 353.0, and a lifter weighing 200 pounds and lifting a total of 1000 pounds would have a normalized lift weight of 288.4.
Thus the 320 pound lifter would win this competition.
As you might have noticed the lighter lifter is actually stronger for his bodyweight, with a total of 5 times his own weight, while the heavier lifter could only manage 4.375 times his own bodyweight.
In this way, the "Wilks Coefficient" places a greater emphasis on absolute strength, rather than ranking lifters solely based on the relative strength of the lifter compared to bodyweight.
This creates an even playing field between light and heavyweight lifters—the lighter lifters tend to have a higher relative strength level in comparison to the heavyweight lifters, who tend to have a greater amount of absolute strength. 
The Sinclair Coefficients are a means to compare different weight classes in olympic weightlifting.
The answer to the question "What would be the total of an athlete weighing "x" kg if he/shewere an athlete in the heaviest class of the same level of ability?"
is given by the formula:ACTUAL TOTAL × SINCLAIR COEFFICIENT = SINCLAIR TOTAL.
There are eight bodyweight categories for male athletes: 56 kg, 62 kg, 69 kg, 77 kg, 85 kg, 94 kg, 105 kg and +105 kg, and seven for female athletes: 48 kg, 53 kg, 58 kg, 63 kg, 69 kg, 75 kg and +75 kg.
There are also two types of lifts: snatch, and clean and jerk.
However, at the championships, medals are presented in both lifts separately, and in total (the combined result of the best snatch and the best clean and jerk).
To compare and rank the results, especially between bodyweight categories, the International Weightlifting Federation uses the Sinclair Coefficients which are derived statistically and calculated for one Olympic cycle (for four years, starting in the Spring of each Olympic year).
The total for each bodyweight category is a projection of the Total for that weightlifter if he/she were a competitor in the heaviest bodyweight category with the same level of ability.
It is done in four body weight categories for the males (56 kg, 69 kg, 77 kg, +105 kg).
For the other four categories (62 kg, 85 kg, 94 kg, 105 kg) the Sinclair Total represents the World Standard because nobody has lifted the predicted total.
Those projections using the Sinclair Total are shown below.
The Sinclair Coefficient is formula_1.
If "x"<"b" where "x" is the weightlifter's bodyweight, "b" is the world record holder's bodyweight (in the heaviest category) and "A" is the coefficient for this Olympic cycle, or 1.0 if "x"≥"b".
Then, the Sinclair Total is simply the obtained total multiplied by the Sinclair Coefficient.
For example, from 2009 to 2012, a calculation of the Sinclair Coefficient might look like this:To understand the whole idea, here is the chart with all male bodyweight categories (in kg) and its world record Totals, Sinclair Coefficients, and Sinclair Total.
By looking at the Sinclair Total we can determine the RANK.
* denotes a World Standard rather than a world record.
The same is done for the seven female body weight categories. 
This is a list of common bodyweight exercises.
Most of these exercises have several variants that can be performed to make the exercise more or less challenging, or to train different muscles.
These variants are described in the articles covering the individual exercises. 
Because they do not require weights, bodyweight exercises are the ideal choice for individuals who are interested in fitness but do not have access to equipment.
However, strength still may be gained through this method.
Weights may still be incorporated to increase the difficulty of most bodyweight exercises.
While some exercises do require some sort of equipment, the majority of bodyweight exercises require none.
For those exercises that do require equipment of some kind, a substitute can usually be improvised (for example, using two branches of a tree to perform triceps dips).
Some bodyweight exercises have been shown to benefit not just the young, but the elderly also.
Bodyweight exercises, compared to weight lifting, often require much more flexibility and balance in order to perform repetitions.
Such exercises include handstand pushups, planche pushups, and bridges.
Many bodyweight exercises can be progressed or regressed to meet the individual's need.
This progression/regression strategy allows nearly all levels of fitness to participate.
Bodyweight training can be used effectively to strengthen the core muscles with the addition of speed or unstable surfaces (such as a stability ball) as well as exercise variations that limit the motion (such as extra wide push-ups or wide pull-ups). 
Olympic weightlifting, also called Olympic-style weightlifting, or weightlifting, is an athletic discipline in the modern Olympic programme in which the athlete attempts a maximum-weight single lift of a barbell loaded with weight plates.
The two competition lifts in order are the snatch and the clean and jerk.
Each weightlifter receives three attempts in each, and the combined total of the highest two successful lifts determines the overall result within a bodyweight category.
Bodyweight categories are different for women and men.
A lifter who fails to complete at least one successful snatch and one successful clean and jerk also fails to "total", and therefore receives an "incomplete" entry for the competition.
The clean and press was once a competition lift, but was discontinued due to difficulties in judging proper form.
In comparison with other strength sports, which test limit strength (with or without lifting aids), Olympic weightlifting tests aspects of human ballistic limits (explosive strength) and are therefore executed faster—and with more mobility and a greater range of motion during their execution - than other lifts.
Properly executed, the snatch and the clean and jerk are both dynamic and explosive while appearing graceful, especially when viewed from a recording at a slowed speed.
While there are relatively few competitive Olympic weightlifters (or more simply "lifters"), the lifts and their components are commonly used by elite athletes in other sports to train for both explosive and functional strength.