This research aims to transit the strengthening and the diminution of the relative endurance in weight training and detraining. and to inverstgate the relation on the relative muscular strengthening and the diminution in the heterogeneous over-load I measured the muscular change of the legs and arms. too. I used both a cross sectional study and a Longitudinal study as a method of study. The condition of over-load...... A group(1/3 over load). B group(1/2 over load) and C group(2/3 over load)...... stimulated a heterogeneous training. During these 12 weeks of training, training was enforced once per a day reguarly. During these 12 weeks of detraining, I measured the was enforced once per a day regularly. During these 12 weeks of detraining, I measured the relative muscular strengthening or diminution once per two weeks while taking an absolute rest. For this time, a muscular form and changing degree were measured, too. The result is as following: 1. A grade of a relative muscular endurance change in weight training is classified A. B. and C. group. A group is about 2-3 times stronger, B group 1.2-2.4 times and C group 1.5-3.3 times than before. A group(1/3 load) is more effective than B (1/2load) and C (2/3 load) group in the strengthening. According to C.R. certification, A and C group are significant in two hand press and curl. In A. B. group, a significant difference is obtained due to leg press. But a great difference is not obtained in B. C. group. There upon, a similar result was obtained in the relative muscular endurance. 2. In detraining, the diminutive change of the relative muscular endurance was graded A. N. and C. A. group was slower than B. C. in the diminutive chance. B. group was slower than C. After 12 in four items……T. H. P., L. E…… A group indicates+6.6, +29.5, +13.2 and +19.5 times. B group indicated+4.0, +25.6, +19.9 and +17.4 times. C group indicated +0, +20.8, +27.7 and 11.8times. 3. In a training, the transformation of a muscular shape was indicated as following. About girth of arm, A group ha increased by +2.3㎝, B Group +2.2㎝, and C group +1.7㎝. About girth of forearm, A group ha increased by +2.5㎝, B Group +2.3㎝, and C group +1.9㎝. About girth of thigh, A group ha increased by +2.5㎝, B Group +2.3㎝, and C group +1.9㎝. About girth of lower thigh, A group ha increased by +1.4㎝, B Group +0.7㎝, and C group +1.0㎝. Conseqently the muscular group’s size of the legs and arms is comparatively load intensifier. A group trained all out is more effective than B. C. group. B. group trained by 1/2 is more effective than C group trained by 2/3. I got above mentioned result.