Times have changed recently and the idea of training to be skinny is no longer the ‘in’ look. Fortunately this mind-set has enabled training to focus on lifting weights and getting strong, without the worry of people thinking you’re too muscular.
If you don’t have a fitness watch you need to work out what your maximum heart rate is manually. This will give you a good guide as to which zones you need to be working in to get the most benefit from your training.