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A variable-resistance kickboard apparatus includes a buoyant kickboard body having an upper surface, a lower surface, and an opening extending through the kickboard body between the upper and lower surfaces. The apparatus also includes a blade extending through the opening and slidably engaged in th

A variable-resistance kickboard apparatus includes a buoyant kickboard body having an upper surface, a lower surface, and an opening extending through the kickboard body between the upper and lower surfaces. The apparatus also includes a blade extending through the opening and slidably engaged in the opening. The blade can be raised and lowered in the opening to adjust the proportion of the blade that extends below the lower surface.

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1. A kickboard apparatus comprising: a buoyant kickboard body comprising an upper surface, a lower surface, and an opening extending through the kickboard body between the upper and lower surfaces;a blade extending through the opening and slidably engaged in the opening, wherein, the blade can be ra

1. A kickboard apparatus comprising: a buoyant kickboard body comprising an upper surface, a lower surface, and an opening extending through the kickboard body between the upper and lower surfaces;a blade extending through the opening and slidably engaged in the opening, wherein, the blade can be raised and lowered in the opening to adjust a proportion of the blade that extends below the lower surface; anda support structure, the support structure extending into the opening, wherein, the support structure comprises a deformation component configured to push the blade against a surface of the support structure;wherein the blade comprises a plurality of longitudinally-spaced-apart indents, and wherein the blade is positionable within the opening so that the deformation component extends into any one of the plurality of indents. 2. The kickboard apparatus according to claim 1 wherein a first side of the blade is biased against a first side of the support structure formed to hold the blade at a fixed angle to the kickboard body. 3. The kickboard apparatus according to claim 2 wherein the blade is frictionally held in the opening by the support structure. 4. The kickboard apparatus according to claim 3 wherein at least a portion of the first side of the support structure is generally perpendicular to the lower surface of the kickboard body. 5. The kickboard apparatus according to claim 1 wherein the blade is generally perpendicular to a longitudinal centerline of the kickboard body. 6. The kickboard apparatus according to claim 4 wherein the blade is held frictionally with a force that is: high enough to prevent the blade from moving up and down in the opening while the kickboard apparatus is being moved through the water by a swimmer; andlow enough to permit a swimmer to manually move the blade up and down in the opening. 7. The kickboard apparatus according to claim 1 wherein the blade is removable from the opening. 8. The kickboard apparatus according to claim 1 wherein a latitudinal cross-section of the blade has a concave shape. 9. A kickboard apparatus comprising: a buoyant kickboard body comprising an upper surface, a lower surface, and an opening extending through the kickboard body between the upper and lower surfaces;a blade extending through the opening and slidably engaged in the opening;wherein the blade can be raised and lowered in the opening to adjust a proportion of the blade that extends below the lower surface; anda support structure, the support structure extending into the opening;wherein the support structure clads a portion of the upper surface adjacent to the opening and the support structure clads a portion of the lower surface adjacent to the opening; and the support structure comprises:an upper component cladding the portion of the upper surface adjacent to the opening; anda lower component cladding the portion of the lower surface adjacent to the opening;wherein:the upper component comprises an upper connector;the lower component comprises a lower connector;at least one of the upper and the lower connector extends into the opening; andthe upper and lower connectors form a connection therebetween. 10. The kickboard apparatus according to claim 9 wherein the connection is a snap-together connection. 11. The kickboard apparatus according to claim 9 wherein the blade comprises a plurality of longitudinally-extending ribs. 12. The kickboard apparatus according to claim 11 wherein the ribs are resiliently deformable. 13. The kickboard apparatus according to claim 9 wherein a first side of the blade is biased against a first side of the support structure formed to hold the blade at a fixed angle to the kickboard body. 14. The kickboard apparatus according to claim 13 wherein the blade is frictionally held in the opening by the support structure. 15. The kickboard apparatus according to claim 14 wherein at least a portion of the first side of the support structure is generally perpendicular to the lower surface of the kickboard body. 16. The kickboard apparatus according to claim 9 wherein the blade is generally perpendicular to a longitudinal centerline of the kickboard body. 17. The kickboard apparatus according to claim 15 wherein the blade is held frictionally with a force that is: high enough to prevent the blade from moving up and down in the opening while the kickboard apparatus is being moved through the water by a swimmer; andlow enough to permit a swimmer to manually move the blade up and down in the opening. 18. The kickboard apparatus according to claim 9 wherein the blade is removable from the opening. 19. The kickboard apparatus according to claim 9 wherein a latitudinal cross-section of the blade has a concave shape.