Section 53(2)(a) in The West Bengal Correctional Services Act, 1992
(a)(i)hard labour shall mean the type of labour the performance of which involves a high degree of physical exertion or application of bodily force, and includes the work of spading, ploughing of land, chopping of wood, coir-pounding, carrying of water on shoulders or head, cooking on the oven and the like;(ii)light labour shall mean the type of labour the performance for which involves physical exertion or application of bodily force of a very small degree, and includes work of shifting of foreign materials or waste products from rice or dal, sweeping the floor or wall and the like;(iii)medium labour shall mean the type of labour which is neither hard nor light;