A gastrointestinal capsule comprising: (a) a capsule housing having a longitudinal axis; (b) a thrusting mechanism, disposed within said housing, said thrusting mechanism including: (i) a rotatably mounted eccentric weight, said thrusting mechanism adapted to rotate said eccentric weight to exert radial forces on said housing, in a radial direction with respect to said axis; and (ii) an axial perturbation arrangement having: a motor; and an urging mechanism, associated with, and driven by, said motor, said urging mechanism adapted to exert axial forces to said capsule housing in an axial direction with respect to said axis, said urging mechanism including: a motor shaft, disposed at least partially in a direction along said longitudinal axis, said shaft operatively connected to, and driven by, said motor; and a thrusting weight associated with said shaft, said urging mechanism further adapted to a least periodically urge said thrusting weight along said shaft, to deliver axial forces; such that, when the capsule is disposed within a gastrointestinal tract of a user, and said mechanism is in an active mode, the gastrointestinal capsule exerts forces in a direction of walls of said tract; and (c) a power supply adapted to power said thrusting mechanism, wherein a ratio of said radial forces to said axial forces, on said housing, by said thrusting mechanism, is at least 1:1, at least 1.25:1, at least 1.5:1, at least 2:1, at least 3:1, at least 4:1, or at least 5:1 said thrusting mechanism configured to have said active mode and a passive mode with respect to said active mode, said active mode including a series of at least two pulses of said radial forces, said series having a first duration, said passive mode having a second duration, said second duration exceeding said first duration said thrusting mechanism configured such that said first duration is within a range of 1-10 seconds, 2-8 seconds, or 2.5-6 seconds. (a) a capsule housing having a longitudinal axis; (b) a thrusting mechanism, disposed within said housing, said thrusting mechanism including: (i) a rotatably mounted eccentric weight, said thrusting mechanism adapted to rotate said eccentric weight to exert radial forces on said housing, in a radial direction with respect to said axis; and (ii) an axial perturbation arrangement having: a motor; and an urging mechanism, associated with, and driven by, said motor, said urging mechanism adapted to exert axial forces to said capsule housing in an axial direction with respect to said axis, said urging mechanism including: a motor shaft, disposed at least partially in a direction along said longitudinal axis, said shaft operatively connected to, and driven by, said motor; and a thrusting weight associated with said shaft, said urging mechanism further adapted to a least periodically urge said thrusting weight along said shaft, to deliver axial forces; such that, when the capsule is disposed within a gastrointestinal tract of a user, and said mechanism is in an active mode, the gastrointestinal capsule exerts forces in a direction of walls of said tract; and (i) a rotatably mounted eccentric weight, said thrusting mechanism adapted to rotate said eccentric weight to exert radial forces on said housing, in a radial direction with respect to said axis; and (ii) an axial perturbation arrangement having: a motor; and an urging mechanism, associated with, and driven by, said motor, said urging mechanism adapted to exert axial forces to said capsule housing in an axial direction with respect to said axis, said urging mechanism including: a motor shaft, disposed at least partially in a direction along said longitudinal axis, said shaft operatively connected to, and driven by, said motor; and a thrusting weight associated with said shaft, said urging mechanism further adapted to a least periodically urge said thrusting weight along said shaft, to deliver axial forces; such that, when the capsule is disposed within a gastrointestinal tract of a user, and said mechanism is in an active mode, the gastrointestinal capsule exerts forces in a direction of walls of said tract; and a motor; and an urging mechanism, associated with, and driven by, said motor, said urging mechanism adapted to exert axial forces to said capsule housing in an axial direction with respect to said axis, said urging mechanism including: a motor shaft, disposed at least partially in a direction along said longitudinal axis, said shaft operatively connected to, and driven by, said motor; and a thrusting weight associated with said shaft, said urging mechanism further adapted to a least periodically urge said thrusting weight along said shaft, to deliver axial forces; such that, when the capsule is disposed within a gastrointestinal tract of a user, and said mechanism is in an active mode, the gastrointestinal capsule exerts forces in a direction of walls of said tract; and a motor shaft, disposed at least partially in a direction along said longitudinal axis, said shaft operatively connected to, and driven by, said motor; and a thrusting weight associated with said shaft, said urging mechanism further adapted to a least periodically urge said thrusting weight along said shaft, to deliver axial forces; such that, when the capsule is disposed within a gastrointestinal tract of a user, and said mechanism is in an active mode, the gastrointestinal capsule exerts forces in a direction of walls of said tract; and (c) a power supply adapted to power said thrusting mechanism,