The sport of boxing is widely practiced around the world, and to compete internationally atthe World championships and the Olympic games, boxers need a high fitness level and one ofthe tools used to achieve a high fitness level is physical and physiological testing formethodological monitoring and planning of training. The aim of this thesis was to study therelationship between training time in boxers, as in the recalled number of weekly traininghours, and the results from four different tests, upper body Wingate anaerobic test (UWAnT),countermovement jump (CMJ), hand grip strength (HGS) and isometric mid-thigh pull(IMTP). The choice of each tests is discussed from a physiological perspective to show itsassociation to boxing performance. Testing consisted of one testing session, which was heldduring a competition period, and 16 male boxers (age=23±5 years) in the senior ranks wereincluded. The results showed that the number of weekly training hours had a weak correlationto HGS (r=0.236, r2=0.056), a strong correlation to CMJ(r=0.570. r2=0.325), a moderatecorrelation to peak isometric strength in IMTP (r=0.343, r2=0.118), a weak correlation torelative peak isometric strength in IMTP (r=0.189, r2=0.036) and a strong correlation to peakanaerobic power, relative peak anaerobic power and the fatigue index in UWAnT (r=0.574,r2=0.329; r=0.769, r2=0.591; r=0.641, r2=0.411 respectively). In the thesis, the appliedmethods and the group of participants included are also discussed to find a suitable way ofstudying the relationship between these and other tests that could be suitable to explaindifferent characteristics of boxing performance. Based on the findings in the thesis, it wasconcluded that HGS and IMTP do not explain strength in boxing performance and, therefore,should be studied further. Also, it was concluded that the different variables in UWAnT andCMJ do explain anaerobic power and capacity and lower body explosive strength in boxingperformance and could, therefore, be used as sport-specific test for boxing.