public async Task<IHttpActionResult> PutExcerciseList(int id, ExcerciseList excerciseList)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != excerciseList.Id)
            {
                return BadRequest();
            }

            _ctx.Entry(excerciseList).State = EntityState.Modified;

            try
            {
                await _ctx.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!ExcerciseListExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }
        public async Task<IHttpActionResult> PostExcerciseList(ExcerciseList excerciseList)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            _ctx.ExcerciseList.Add(excerciseList);
            await _ctx.SaveChangesAsync();

            return CreatedAtRoute("DefaultApi", new { id = excerciseList.Id }, excerciseList);
        }
        public void ExcerciseAdd(Activity act, DateTime begin, DateTime end)
        {
            var activity = ActivitiList.SingleOrDefault(a => a.Name == act.Name);

            if (activity == null)
            {
                ActivitiList.Add(act);
                var excercise = new Excercise(CurrUser, begin, end, act);
                ExcerciseList.Add(excercise);
            }
            else
            {
                var excercise = new Excercise(CurrUser, begin, end, activity);
                ExcerciseList.Add(excercise);
            }

            SaveData();
        }