I am a bjj practitioner and I want to start weightlifting for injury prevention. But how it works? Should I necessarily lift heavy? I saw some articles that suggest to use kettlebells for grapplers. So can I use relatively light weights for my purpose? My question is caused by the fact that I have no lot of time to go to a lifting gym but I have light barbell at home (up to 40 kg weight in sum), pull up bar and parallel bars for dips. So will it be beneficial for my purpose just do for example Javorek's complex with light barbell (so it will be like I'm using a kettlebell), pull ups and dips?