in one aspect , the present invention relates to an exercise rug 10 , which can be used by a user for various activities . preferably , the user exercises on the exercise rug 10 of the invention . the practice of mat - based exercise , such as hatha yoga and pilates , has become extremely popular in recent years . types of hatha yoga mat - based exercise include , but are not limited to , bikram yoga , ashtanga yoga , power yoga , vinyasa flow yoga and hot yoga . the exercise rug 10 of the present invention can be used in these types of mat - based exercise , as well as for other types of physical exercise such as aerobics , dancing , physical training , etc . the exercise rug 10 of the present invention is woven in order to provide some absorption of moisture into the exercise rug 10 . the exercise rug 10 can be made by any suitable , conventional weaving process known to persons skilled in the art . the exercise rug 10 of the present invention includes contours , such as the ridges 14 shown in fig1 on the exercise surface 12 of the exercise rug 10 . the contours reduce slipping by touching various parts of the user &# 39 ; s hands and feet and serving as a grip to hold the user &# 39 ; s hands and / or feet in place on the exercise rug when the user has been perspiring . various forms of contours can be employed for this purpose . for example , instead of the ridges 14 , other contours such as indentations in the exercise surface 12 , web or dot patterns of contours which protrude relative to a non - contoured portion of the exercise surface , and / or combinations of two or more of these different types of contours can be employed . the contours should be of sufficient size to provide a user of the exercise rug 10 with an improved grip on the contoured portion of the exercise surface 12 , as compared to the user &# 39 ; s grip on a non - contoured exercise surface of a woven exercise rug . in the context of the present application , the term , “ contour ” requires the presence of a portion of the rug that protrudes relative to a non - contoured portion of the exercise surface of the rug , a portion of the rug that is indented relative to a non - contoured portion of the exercise surface of the rug , or a portion of the rug that either protrudes relative to a non - contoured portion of the exercise surface or is indented relative to a non - contoured portion of the exercise surface . preferably , the contours do not form a structurally necessary portion of the rug . as an example , for a rug that is about { fraction ( 1 / 8 )} inch thick , the contours may protrude approximately { fraction ( 1 / 8 )} inch above the exercise surface of the rug or be indented up to about { fraction ( 1 / 16 )} inch into the exercise surface of the rug . neither the precise height nor the depth of the contours , nor the spacing of the contours are critical to the function of the rug . rather , the height or depth of the contours must be sufficient to provide a traction surface and the spacing of the contours can be in any form , and the contours can even be formed to provide decoration to the exercise rug . the exercise rug 10 shown in fig1 is generally rectangular in shape to provide the desired exercise surface 12 while helping to minimize the size of the exercise rug 10 . thus , in use , the user will orient the exercise rug 10 with the longer dimension facing in the direction of the user so that the user can kneel and / or lay down with their whole body still on the exercise surface 12 . other suitable shapes such as oval , elliptical , polygonal , round , etc . can also be employed , and the exercise rug 10 of the present invention is not limited to a particular shape . advantageously , the contours of the rug 10 are oriented substantially perpendicular to the longer dimension of the rug 10 since generally the longer dimension of the rug 10 corresponds to the direction that the user will face when using the exercise rug 10 , as discussed above . for example , as shown in fig1 the ridges 14 are oriented substantially perpendicular to the direction that the user will face . the ridges 14 reduce slipping by contact various parts of the user &# 39 ; s hands and feet and serving as a grip to hold the user &# 39 ; s hands and / or feet in place on the exercise rug 10 when the user has been perspiring . also , the user may position his - or her hands and feet so that fingers and / or toes are placed against the ridges 14 to provide further resistance against slipping or sliding on the exercise rug 10 . in a preferred form of the exercise rug 10 of the present invention , supplementary wefts ( i . e . wefts that are not essential to the structural integrity of the rug , but are added to create a textured effect ) are added to a rug to create a series of ridges 14 that run the width of the rug 10 as shown in fig1 . more preferably , such supplementary wefts are added to a conventional , balanced weave rug to provide contours on the exercise surface 12 of the rug 10 , thereby creating a textured effect as shown in fig1 . the contours may also be provided by supplementary warps or a combination of supplementary wefts and supplementary warps , depending primarily on the desired geometry of the contours . the exercise rug 10 of the present invention may be used in a variety of different ways . for example , the exercise rug 10 may be placed on top of a conventional exercise mat or may be used in place of a conventional exercise mat or yoga rug . the exercise rug of the present invention promotes physical stability during mat - based exercise . in an alternative embodiment , the exercise rug 10 includes additional structure on the surface opposite the exercise surface 12 for holding the exercise rug 10 in place on the ground , floor or on an exercise mat . such additional structure may be any conventional means known for this purpose , such as a layer of rubber or other resilient material , suction cups , fasteners such as velcro ®, or other suitable means . in a more preferred embodiment , the present invention relates to an exercise rug 10 that has ridges 14 woven at specific intervals in the vicinity of the upper edge 18 and lower edge 20 of the exercise rug . thus , in the example of fig1 the exercise rug 10 is 200 cm . in length from the upper edge 18 to the lower edge 20 . a first set of ridges 14 are positioned about 9 cm from the upper edge 18 and lower edge 20 and a second set of ridges 14 are positioned about 9 cm from the first set of ridges 14 . a third set of ridges 14 are placed about 9 cm from the second set of ridges 14 . the remaining ridges 14 are spaced about 4 . 5 cm from the third set of ridges 14 , as shown . in this manner , the ridges 14 are placed on the exercise surface 12 at locations where the ridges 14 will provide the most beneficial effect , while at the same time , providing the least degree of hindrance to the user . in general , in the preferred embodiment , the exercise surface 12 is divided into a upper portion 19 , a lower portion 21 and a central portion 22 . preferably , the contours of the invention are located only in one or both of the upper portion 19 and lower portion 21 and no contours are located in the central portion 22 , to thereby provide a more comfortable exercise surface in central portion 22 . alternatively , in some embodiments it may also be desirable to locate contours in the central portion 22 . the relative sizes of the upper portion 19 , lower portion 21 and central portion 22 can be varied to accommodate different sized users , to fit with different shaped exercise rugs , or to accommodate different types of exercise on the rug 10 . the upper portion 19 may also be larger , smaller , or equivalent in size to the lower portion 21 . in one embodiment , as shown in fig1 the area of the central portion 22 is larger than the area of each of the upper portion 19 and the lower portion 21 . more preferably , also as shown in fig1 the area of the central portion 22 is larger than the combined area of the upper portion 19 and lower portion 21 . referring to fig2 there is shown a side view of the rug 10 of fig1 to show the contours formed by ridges 14 protruding relative to a non - contoured portion of the exercise surface 12 . [ 0029 ] fig3 shows an alternative embodiment of an exercise rug 10 in accordance with the present invention wherein the contours are formed by indentations 30 in the exercise surface 12 . indentations 30 may be of any suitable shape and are preferably concavely rounded , as shown in fig3 . the indentations 30 may form the same pattern in the exercise surface as the ridges 14 shown in fig1 or other patterns may be employed , so long as a sufficient sized traction surface is provided by the indentations 30 . [ 0030 ] fig4 shows yet another alternative embodiment of an exercise rug in accordance with the present invention . in this embodiment , the contours 42 are formed by the addition of a foam rubber portion 40 to the exercise surface 12 . other , similar materials may be employed instead of foam rubber to provide the contours . suitable materials should provide a traction surface , be firmly adhered to the rug and , preferably , absorb moisture . the present invention has been described with reference to preferred embodiments thereof . many modifications and variations within the scope of the invention will be apparent to a skilled person and thus the scope of the invention is to be determined by the claims appended hereto .