Grappler, if you lack grip strength, explosive power and/or overall strength and aren't doing anything about it, then you deserve the daily and ritualistic beatdowns you are getting from that violent 3-week-in white belt with. I kid. We both know you aren't training daily (but you should be).
Listen up. There are many fitness and strength training coaches out there who put out great material on video/DVD and travel the globe teaching seminars for our education. From Crossfit to kettlebells to Clubbells to bodyweight stuff - it's all good as long as you train it and give 100%. I personally like Mile Mahler and his style of training (along with many others) who teach hardcore strength and fitness (Mike's primarily involved in KB's).
Check out Mahler's latest free training vid designed with the MMA athlete in mind.