Every athlete looks for a new challenge at some point, and these 50 challenges allow them to set new training goals and sharpen their competitive spirit. Whether it’s the 5-minute multi-plank, the six-pack workout, HIIT and Tabata sessions, or the burpee challenge – it’s all about time, endurance, strength, speed and maximum repetitions. Training equipment such as dumbbells or mini-bands can also be used to push every trainee to their maximum performance limits. The challenges last between 5 and 15 minutes and can be carried out anywhere. All workouts are clearly laid out and fully illustrated, and thanks to varying levels of difficulty, they are suitable for both beginners and advanced trainees. Furthermore, all exercises are described in detail once again in a separate chapter. With the 50 best challenges, every trainee can take on new sporting challenges, test their fitness, compete with others and track their own progress. The ‘50 Workouts’ guide series presents the 50 best exercise routines on current fitness topics – clearly laid out and compact, fully illustrated throughout and at an unbeatable price. About the author: Marcel Doll studied Fitness Economics (BA) and completed his Master’s degree in Health Management and Prevention, specialising in sports psychology and stress management. He has also completed numerous further training courses in the fields of sport and fitness. He is a co-founder of YOU Personal Training in Offenburg, where he works as a personal trainer. As a certified Functional Circuit Trainer, he organises small-group training sessions based on the circuit training principle. He also writes for Functional Training Magazine and www.Trainingsworld.com. His first book, *The Ultimate Suspension Training*, was published by riva Verlag in 2014. Further titles followed: *Fit with the Mini Band*, *50 Workouts – Fit in 7 Minutes*, *50 Workouts – Bodyweight Training without Equipment* and *Circuit Training – Indoor and Outdoor*.

Circuit training has shed its outdated image as a gym activity and is back in vogue thanks to the popularity of functional training. It allows for targeted training of specific muscle groups, and the combination of strength and endurance ensures an effective full-body workout. Based on the latest sports science research, this book presents various training variations: whether with or without small equipment, alone or in a group, indoors or outdoors – circuit training can be done anytime, anywhere, and works the cardiovascular system better than almost any other form of exercise. As well as a wide selection of exercises, the book contains 20 circuit plans and highlights specific training focuses for every fitness level. Beginners will find this fitness guide offers a straightforward start to their training, whilst advanced athletes will benefit from the circuits, which are optimally tailored to each area of the body. About the author Marcel Doll studied Fitness Economics (BA) and completed his Master’s degree in Health Management and Prevention, specialising in sports psychology and stress management. He has also completed numerous further training courses in the fields of sport and fitness. He is a co-founder of YOU Personal Training in Offenburg, where he works as a personal trainer. As a certified Functional Circuit Trainer, he organises small-group training sessions based on the circuit training principle. He also writes for Functional Training Magazine and www.Trainingsworld.com. His first book, *The Ultimate Suspension Training*, was published by riva Verlag in 2014, followed in 2016 by *Fit with the Mini Band*.